library settings

When compiling Quartus II project, I keeps getting error: component ... not found or could not be instantiated.

I have add my users' components library directory at "Tools->Options->libraries"

and at Qsys "Tools->Options->IP search path"
Qsys was generated successfully.

Is there anywhere else I need to modify regarding to this error?
I noticed the .qsf has changed automatically once I modified the library directory at Menu "Options"
The .ipx file is basically for Qsys to find its components and it has no problem either.

Any advice is welcome.
I have no clue at this point.
Thank you.