title: No signature of method [] is applicable for argument types
body: <p>Hi i have this service:</p>
  
  <pre><code>def insertAction(int Id, String Name){
          def sql = new Sql(dataSource)
          sql.execute("INSERT INTO  mn (id, name) VALUES ($Id,$Name)")
      }
  </code></pre>
  
  <p>this controller:</p>
  
  <pre><code>def save() {
         println params
         [contact: contactListService.insertAction(params.id,params.Name)]
          redirect action: "create"
  </code></pre>
  
  <p>And when i create a new entry i get this error</p>
  
  <p>No signature of method: contactlist.ContactListService.insertAction() is applicable for argument types: (null, java.lang.String) values: [null, das] Possible solutions: insertAction(int, java.lang.String), listAction()</p>