title: Yii2 mp3 upload does not work for some users
body: <p>I created a website where artists can upload songs and pictures. For most people everything works fine, bute somethimes a user gets the following error: </p>
  
  <p>"The server encountered an internal error or misconfiguration and was unable to complete your request.</p>
  
  <p>Please contact the server administrator, service@webmailer.de and inform them of the time the error occurred, and anything you might have done that may have caused the error.</p>
  
  <p>More information about this error may be available in the server error log."</p>
  
  <p>maybe it's a problem of the server ? at the error log i can't find something, there are no entrys at this time. </p>
  
  <p>the code is this ffor the controller action: </p>
  
  <pre><code>$musiker = Yii::$app-&gt;user-&gt;identity-&gt;username;
                  $songgenre = $model-&gt;songgenre;
  
                  $model-&gt;song = UploadedFile::getInstance($model, 'song');
                  $dateiname = 'songs/'.$musiker.''.time().'.'.$model-&gt;song-&gt;extension;
                  $model-&gt;song-&gt;saveAs($dateiname);
                  $model-&gt;saveSong($musiker, $songname, $songgenre, $dateiname);
  </code></pre>
  
  <p>and the form which i use for upload: </p>
  
  <pre><code>//Song hochladen    
      echo "&lt;div class='row-fluid'&gt;";
          echo "&lt;div class=' col-md-12'&gt;";
              $form = ActiveForm::begin(['options'=&gt;['enctype'=&gt;'multipart/form-data']]);     
              echo $form-&gt;field($model,'song')-&gt;fileInput()-&gt;label(false);
              echo $form-&gt;field($model, 'songname');
              echo $form-&gt;field($model, 'songgenre')-&gt; listBox(array('Wave'=&gt;'Wave','Rock'=&gt;'Rock','Pop'=&gt;'Pop','Metal'=&gt;'Metal','Punk'=&gt;'Punk','Schlager'=&gt;'Schlager', 'Elektro'=&gt;'Elektro'))-&gt;label(false);  
              echo "&lt;div class='form-group'&gt;";
                  echo "&lt;input type='submit' name = 'song' class='btn  btn-primary' onClick='load()' value='hinzufügen'/&gt;";
  
              echo "&lt;/div&gt;";
          echo "&lt;/div&gt;";
          ActiveForm::end();
  </code></pre>
  
  <p>has someone any idea where the problem could be ? </p>