Re: vSphere Web Client Error - An internal error has occurred - Error #1009.

Hello,

can you confirm that you followed the steps below when initially removing the third party plugin? (from KB 1025360)

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To remove unwanted plug-ins from the Available Plug-ins list:

1. In a web browser, navigate to http://vCenter_Server_name_or_IP/mob.
   
   Where vCenter_Server_name_or_IP is the name of your vCenter Server or its IP address.
   
   
2. Click Content.
3. Click ExtensionManager.
4. Select and copy the name of the plug-in you want to remove from the list of values under Properties. For a list of default plug-ins, see the Additional Information section of this article.
5. Click UnregisterExtension. A new window appears.
6. Paste the name of the plug-in and click Invoke Method. This removes the plug-in.
7. Close the window.
8. Refresh the Managed Object Type:ManagedObjectReference:ExtensionManager window to verify that the plug-in is removed successfully.

Note: If the plug-in still appears, you may have to restart the vSphere Client.

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