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pMjXgx Yeah, now it's clear !... And firstly I did not understand very much where there was the link with the title itself !!...

=Run-time errors=
<table width="90%" border="1" cellspacing="2" cellpadding="2">
  <tr>
    <th scope="col" width="20%">Error code</th>
    <th scope="col" width="40%">Description</th>
    <th scope="col" width="40%">Solution or workaround</th>
  </tr>
<tr>
  <td>1009</td>
  <td>TypeError - Cannot access a property or method of a null object reference</td>
  <td>When using modules, be careful using shared code between modules that share the same classes or assets.   If those modules share managers, then the developer must be careful. One common mistake is to accidentally bring in Managers (PopUpManger, DragManager) in a module and use from another module.  For more information, see [http://thanksmister.com/?p=54 http://thanksmister.com/?p=54].
<p>If you get this error from clicking a cell an ItemRenderer, add the following line to the renderer's "override public function set data(...)":
</p><p>super.data = value;
</p>
</td>
</tr>
<tr>
   <td>1030</td>
   <td>VerifyError</td>
   <td>Make sure you are running the current version of the player.</td>
</tr>
<tr>
   <td>1034</td>
   <td>TypeError: Type Coercion failed: cannot convert <i>class</i> to <i>class</i>.</td>
   <td>This is a common error when two modules or SWFs try to share a class across ApplicationDomains.</td>
</tr>
  <tr>
   <td>1068</td>
   <td>VerifyError: <i>classname</i> and <i>classname</i> Cannot be reconciled</td>
   <td>One developer who experienced this error reports that restarting the application 
        server fixed the problem. Another found that removing a preceding switch statement from the function that triggered the error worked. Yet another found that the error was caused while triggering a function containing a switch statement itself - the problem was fixed by replacing the switch statement with a series of if statements.  Yet another found that the error was caused while triggering a function containing a ternary operator - the problem was fixed by replacing this with an if..else statement.</td>
  </tr>
  <tr>
   <td>1151</td>
   <td>A conflict exists with definition <i>definition</i> in namespace <i>namespace</i></td>
   <td>The declaration of a variable of a certain type cannot be overridden to a different type in the same scope.</td>
  </tr>
  <tr>
   <td>1502</td>
   <td>A script has executed for longer than the default timeout period of 15 seconds.</td>
   <td>For Flex Charting, ensure that you're using unique category names in the category axis.</td>
  </tr>
   <tr>
    <td>2032</td>
    <td>HTTP request error</td>
    <td>The referenced resource does not exist or the swf is trying to access a file across a restricted domain. </td>
  </tr>
   <tr>
    <td>2038</td>
    <td>IO error</td>
    <td>This is an HTTP 403 error. The problem is that Flex tranfers with "final boundary missing" in the MIME request. So if you have an ISS with Linux Server you should try to set .htaccess file adding this 2 lines:
<pre>
SecFilterEngine Off
SecFilterScanPOST Off
</pre>
This is reported on http://weblog.cahlan.com/2006/09/uploading-files-with-flex-and-php.html. 

May also refer to a 404 not found. 

</td>


  </tr>

  <tr>
    <td>2082</td>
    <td>Connect failed because the object is already connected.</td>
    <td>If your application dies unexpectedly, it can leave the history LocalConnection in a hung state:
<ul>
<li>One workaround is to shut down all instances of the Flash Player, including all browsers, and Yahoo IM, then you should be all set. 
</li>
<li>A code-based workaround is as follows:<br />

If connecting to a named LocalConnection "A" fails, you can try setting up a temporary callback LocalConnection and then invoke a send() to connection "A". If the owning instance is running it receives the call to connection "A" and should ping back over the temporary connection and you'll know that the connect failure is legitimate because the owning player instance is running. If you don"t hear back after 5 seconds (magic number) the Player assumes that connection "A" is orphaned and cleans up the shared memory, and at this point you can retry your connect() and it should succeed.
</li>
</ul>
<p>Another cause of this error is using managers (or other singletons) within a module before they're loaded by the main application. There's a lengthy thread on this topic in flexcoders here: [http://tech.groups.yahoo.com/group/flexcoders/message/63829 http://tech.groups.yahoo.com/group/flexcoders/message/63829]
</p>
     </td>
  </tr>
  <tr>
    <td>2137</td>
    <td>Sandbox security violation</td>
    <td>Possible solutions include:
<ul>
<li>You are accessing a remote asset but the remote web server does not have a crossdomain.xml file or the crossdomain.xml file's allow-access-from domain attribute doesn't allow access from your domain. For more information, see [http://livedocs.adobe.com/flex/201/html/05B_Security_176_04.html http://livedocs.adobe.com/flex/201/html/05B_Security_176_04.html]</li>
<li>You did not specify the appropriate value for the use-network compiler option. For more information, see [http://livedocs.adobe.com/flex/201/html/compilers_123_24.html http://livedocs.adobe.com/flex/201/html/compilers_123_24.html]</li>
</ul>
</td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td>SWF is not a loadable module</td>
    <td>If you load modules across domains, the target domain must implement a crossdomain.xml file with the appropriate permissions.</td>
  </tr>
</table>