Fedor,
Thank you for reporting this error. We did fix an issue recently with the same error being logged when invoking the Navigate > Open Resource dialog from menu.
Can you please let us know for which other UI operations are you seeing the error being logged? Please switch to the Angular Perspective and check if the error is logged.
If possible, please send us a screenshot of the command handler for the UI operation to help us verify our fix. In the Angular Perspective, invoke Alt + Shift + F2 and then select the UI operation. A dialog named ‘Plug-in Menu Spy’ will pop up with the plugin information for the command.
Apologies for inconvenience caused.
–Swapna
MyEclipse Support