pdf extracting with iText error occured
===

I want to extract the text from a pdf-file on the internet to a string in java using iText. This is my code:

    package me.moop.mytwitter;
    
    import java.io.IOException;
    import java.text.ParseException;
    
    import com.itextpdf.text.pdf.PdfReader;
    import com.itextpdf.text.pdf.parser.PdfReaderContentParser;
    import com.itextpdf.text.pdf.parser.PdfTextExtractor;
    import com.itextpdf.text.pdf.parser.SimpleTextExtractionStrategy;
    
    import android.os.AsyncTask;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
    import android.widget.Toast;
    import android.app.Activity;
    import android.app.ProgressDialog;
    
    public class MainActivity extends Activity {
    	
    	Button mBtnCheck;
    	EditText mEtxtGroup;
    	ProgressDialog mProgressDialog;
    	TextView mTxtv1;
    	
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.nicelayout3);
            
            mBtnCheck = (Button) findViewById(R.id.btnCheck);
            mEtxtGroup = (EditText) findViewById(R.id.etxtGroup);
            mTxtv1 = (TextView) findViewById(R.id.textView1);
            
        }
        
          public void checkScheduleChange(View view){
        	if (view == mBtnCheck){
        		String group;
        		group = mEtxtGroup.getText().toString();
        		if (group.length() > 0){
        			mProgressDialog = new ProgressDialog(this);
        			mProgressDialog.setMessage("Bezig met checken voor roosterwijzigingen...");
        			mProgressDialog.show();
        			new CheckScheduleChangeTask().execute();
        		}
        		else{
        			Toast.makeText(this, "Voer een klas in", Toast.LENGTH_LONG).show();
        		}
        	}
        }
        
        private class CheckScheduleChangeTask extends AsyncTask<Void, Void, Void> {
        	
        	String content;
        	
    		@Override
    		protected Void doInBackground(Void... args) {
    			
    			PdfReader reader = null;
    			try {
    				reader = new PdfReader("http://www.augustinianum.eu/roosterwijzigingen/14062012.pdf");
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			try {
    				content = PdfTextExtractor.getTextFromPage(reader, 1);
    			} catch (IOException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			
    			return null;
    		}
    
    		@Override
    		protected void onPostExecute(Void arg) {
    			mProgressDialog.dismiss();
    			
    	    		String group = mEtxtGroup.getText().toString();
    	    		if (content.contains(group)){
    	    			Toast.makeText(MainActivity.this, "U hebt een roosterwijziging", Toast.LENGTH_LONG).show();
    	    		}	
    	    		mTxtv1.setText(content);
    		}
        }
    }
For the people in a hurry, here's the iText part:

    private class CheckScheduleChangeTask extends AsyncTask<Void, Void, Void> {
    	
    	String content;
    	
		@Override
		protected Void doInBackground(Void... args) {
			
			PdfReader reader = null;
			try {
				reader = new PdfReader("http://www.augustinianum.eu/roosterwijzigingen/14062012.pdf");
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				content = PdfTextExtractor.getTextFromPage(reader, 1);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			return null;
		}

		@Override
		protected void onPostExecute(Void arg) {
        // more code
        }
Whenever I launch this in my emulator I'm getting a fore close after calling the class: CheckScheduleChangeTask. This is the log:

    07-27 09:15:08.354: D/ddm-heap(222): Got feature list request
    07-27 09:15:12.994: E/dalvikvm(222): Could not find class 'com.itextpdf.text.pdf.PdfReader', referenced from method me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground
    07-27 09:15:13.004: W/dalvikvm(222): VFY: unable to resolve new-instance 410 (Lcom/itextpdf/text/pdf/PdfReader;) in Lme/moop/mytwitter/MainActivity$CheckScheduleChangeTask;
    07-27 09:15:13.004: D/dalvikvm(222): VFY: replacing opcode 0x22 at 0x0002
    07-27 09:15:13.004: D/dalvikvm(222): Making a copy of Lme/moop/mytwitter/MainActivity$CheckScheduleChangeTask;.doInBackground code (137 bytes)
    07-27 09:15:13.004: E/dalvikvm(222): Could not find class 'com.itextpdf.text.pdf.parser.PdfReaderContentParser', referenced from method me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground
    07-27 09:15:13.004: W/dalvikvm(222): VFY: unable to resolve new-instance 411 (Lcom/itextpdf/text/pdf/parser/PdfReaderContentParser;) in Lme/moop/mytwitter/MainActivity$CheckScheduleChangeTask;
    07-27 09:15:13.004: D/dalvikvm(222): VFY: replacing opcode 0x22 at 0x000a
    07-27 09:15:13.045: W/dalvikvm(222): threadid=15: thread exiting with uncaught exception (group=0x4001b188)
    07-27 09:15:13.045: E/AndroidRuntime(222): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception
    07-27 09:15:13.135: E/AndroidRuntime(222): java.lang.RuntimeException: An error occured while executing doInBackground()
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at android.os.AsyncTask$3.done(AsyncTask.java:200)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at java.lang.Thread.run(Thread.java:1096)
    07-27 09:15:13.135: E/AndroidRuntime(222): Caused by: java.lang.NoClassDefFoundError: com.itextpdf.text.pdf.PdfReader
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground(MainActivity.java:84)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground(MainActivity.java:1)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at android.os.AsyncTask$2.call(AsyncTask.java:185)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    07-27 09:15:13.135: E/AndroidRuntime(222): 	... 4 more
    07-27 09:15:13.164: I/dalvikvm(222): threadid=7: reacting to signal 3
    07-27 09:15:13.394: I/dalvikvm(222): Wrote stack trace to '/data/anr/traces.txt'
    07-27 09:15:16.894: I/Process(222): Sending signal. PID: 222 SIG: 9
    07-27 09:17:59.094: E/dalvikvm(252): Could not find class 'com.itextpdf.text.pdf.PdfReader', referenced from method me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground
    07-27 09:17:59.094: W/dalvikvm(252): VFY: unable to resolve new-instance 410 (Lcom/itextpdf/text/pdf/PdfReader;) in Lme/moop/mytwitter/MainActivity$CheckScheduleChangeTask;
    07-27 09:17:59.094: D/dalvikvm(252): VFY: replacing opcode 0x22 at 0x0002
    07-27 09:17:59.094: D/dalvikvm(252): Making a copy of Lme/moop/mytwitter/MainActivity$CheckScheduleChangeTask;.doInBackground code (137 bytes)
    07-27 09:17:59.094: E/dalvikvm(252): Could not find class 'com.itextpdf.text.pdf.parser.PdfReaderContentParser', referenced from method me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground
    07-27 09:17:59.094: W/dalvikvm(252): VFY: unable to resolve new-instance 411 (Lcom/itextpdf/text/pdf/parser/PdfReaderContentParser;) in Lme/moop/mytwitter/MainActivity$CheckScheduleChangeTask;
    07-27 09:17:59.094: D/dalvikvm(252): VFY: replacing opcode 0x22 at 0x000a
    07-27 09:17:59.124: W/dalvikvm(252): threadid=15: thread exiting with uncaught exception (group=0x4001b188)
    07-27 09:17:59.124: E/AndroidRuntime(252): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception
    07-27 09:17:59.134: E/AndroidRuntime(252): java.lang.RuntimeException: An error occured while executing doInBackground()
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at android.os.AsyncTask$3.done(AsyncTask.java:200)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at java.lang.Thread.run(Thread.java:1096)
    07-27 09:17:59.134: E/AndroidRuntime(252): Caused by: java.lang.NoClassDefFoundError: com.itextpdf.text.pdf.PdfReader
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground(MainActivity.java:70)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground(MainActivity.java:1)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at android.os.AsyncTask$2.call(AsyncTask.java:185)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    07-27 09:17:59.134: E/AndroidRuntime(252): 	... 4 more
    07-27 09:17:59.521: I/dalvikvm(252): threadid=7: reacting to signal 3
    07-27 09:17:59.794: I/dalvikvm(252): Wrote stack trace to '/data/anr/traces.txt'
    07-27 09:18:02.743: I/Process(252): Sending signal. PID: 252 SIG: 9
    07-27 09:26:26.713: E/dalvikvm(280): Could not find class 'com.itextpdf.text.pdf.PdfReader', referenced from method me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground
    07-27 09:26:26.723: W/dalvikvm(280): VFY: unable to resolve new-instance 410 (Lcom/itextpdf/text/pdf/PdfReader;) in Lme/moop/mytwitter/MainActivity$CheckScheduleChangeTask;
    07-27 09:26:26.723: D/dalvikvm(280): VFY: replacing opcode 0x22 at 0x0001
    07-27 09:26:26.723: D/dalvikvm(280): Making a copy of Lme/moop/mytwitter/MainActivity$CheckScheduleChangeTask;.doInBackground code (93 bytes)
    07-27 09:26:26.723: I/dalvikvm(280): Could not find method com.itextpdf.text.pdf.parser.PdfTextExtractor.getTextFromPage, referenced from method me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground
    07-27 09:26:26.723: W/dalvikvm(280): VFY: unable to resolve static method 2969: Lcom/itextpdf/text/pdf/parser/PdfTextExtractor;.getTextFromPage (Lcom/itextpdf/text/pdf/PdfReader;I)Ljava/lang/String;
    07-27 09:26:26.723: D/dalvikvm(280): VFY: replacing opcode 0x71 at 0x000a
    07-27 09:26:26.754: W/dalvikvm(280): threadid=15: thread exiting with uncaught exception (group=0x4001b188)
    07-27 09:26:26.754: E/AndroidRuntime(280): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception
    07-27 09:26:26.763: E/AndroidRuntime(280): java.lang.RuntimeException: An error occured while executing doInBackground()
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at android.os.AsyncTask$3.done(AsyncTask.java:200)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at java.lang.Thread.run(Thread.java:1096)
    07-27 09:26:26.763: E/AndroidRuntime(280): Caused by: java.lang.NoClassDefFoundError: com.itextpdf.text.pdf.PdfReader
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground(MainActivity.java:68)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground(MainActivity.java:1)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at android.os.AsyncTask$2.call(AsyncTask.java:185)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    07-27 09:26:26.763: E/AndroidRuntime(280): 	... 4 more
    07-27 09:26:27.063: I/dalvikvm(280): threadid=7: reacting to signal 3
    07-27 09:26:27.404: I/dalvikvm(280): Wrote stack trace to '/data/anr/traces.txt'
    07-27 09:46:50.573: E/dalvikvm(308): Could not find class 'com.itextpdf.text.pdf.PdfReader', referenced from method me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground
    07-27 09:46:50.573: W/dalvikvm(308): VFY: unable to resolve new-instance 410 (Lcom/itextpdf/text/pdf/PdfReader;) in Lme/moop/mytwitter/MainActivity$CheckScheduleChangeTask;
    07-27 09:46:50.573: D/dalvikvm(308): VFY: replacing opcode 0x22 at 0x0001
    07-27 09:46:50.573: D/dalvikvm(308): Making a copy of Lme/moop/mytwitter/MainActivity$CheckScheduleChangeTask;.doInBackground code (97 bytes)
    07-27 09:46:50.573: I/dalvikvm(308): Could not find method com.itextpdf.text.pdf.parser.PdfTextExtractor.getTextFromPage, referenced from method me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground
    07-27 09:46:50.573: W/dalvikvm(308): VFY: unable to resolve static method 2969: Lcom/itextpdf/text/pdf/parser/PdfTextExtractor;.getTextFromPage (Lcom/itextpdf/text/pdf/PdfReader;I)Ljava/lang/String;
    07-27 09:46:50.583: D/dalvikvm(308): VFY: replacing opcode 0x71 at 0x000a
    07-27 09:46:50.624: W/dalvikvm(308): threadid=15: thread exiting with uncaught exception (group=0x4001b188)
    07-27 09:46:50.624: E/AndroidRuntime(308): Uncaught handler: thread AsyncTask #1 exiting due to uncaught exception
    07-27 09:46:50.634: E/AndroidRuntime(308): java.lang.RuntimeException: An error occured while executing doInBackground()
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at android.os.AsyncTask$3.done(AsyncTask.java:200)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at java.util.concurrent.FutureTask.run(FutureTask.java:137)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at java.lang.Thread.run(Thread.java:1096)
    07-27 09:46:50.634: E/AndroidRuntime(308): Caused by: java.lang.NoClassDefFoundError: com.itextpdf.text.pdf.PdfReader
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground(MainActivity.java:68)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at me.moop.mytwitter.MainActivity$CheckScheduleChangeTask.doInBackground(MainActivity.java:1)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at android.os.AsyncTask$2.call(AsyncTask.java:185)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
    07-27 09:46:50.634: E/AndroidRuntime(308): 	... 4 more
    07-27 09:46:51.105: I/dalvikvm(308): threadid=7: reacting to signal 3
    07-27 09:46:51.423: I/dalvikvm(308): Wrote stack trace to '/data/anr/traces.txt'
    07-27 09:46:54.444: I/Process(308): Sending signal. PID: 308 SIG: 9
It seems like there's something wrong with the imports. Does anyone know how to fix this?

THANK YOU!