Unable to resolve resource bundle

Hello,

I am using Flash Builder 4.5.
I have added the FlashEff build paths to the project's settings, and when I compile the project I get the error:
Unable to resolve resource bundle "core" for locale "en_US"

I really don't know how to fix this error, please help.

Thanks.

I don't think that this is a problem caused by FlashEff component.
Anyway bellow you can find some threads about the same problem. Hopefully one of the solution the guys posted there will help you as well.
[forums.adobe.com]
[stackoverflow.com]

Thank you but my application worked before I have added the FlashEff SWCs.
I have searched for solution online and didn't find a solution that worked.
You are not familiar with this issue?

I have identified where the problem is.
I get the error only when I initialize the FlashEff2Flex component.
I have the line:
private var _currentEffect:FlashEff2Flex = new FlashEff2Flex();

If I remove the line, the error doesn't occur.

What can be the problem?