Hi Michele,
1) Try set "Recompile All files"
or
2) Try recompile classlib from command window
or
3) if any class of the VCX Lib is depend on another VCX lib, try recompile antehr VCX lib

MartiJ


>Hello everyone:
>
> I have a project, it always clue to "library file "x:\...\***.vcx" is invalid" when I complie the project, but the project still can build exe file sucessfully, and the exe file still can be run, and the ***.vcx file still can be modified ( assumably is good), Can you give me a way to solve this error, thank you!