Warning: ... entity does not exist in design

[Altera_Forum]

After compiling my project, I got this error: Can't set a partition on "clipper:c1" which is not a hierarchy in the user design. 

 I also get a warning after doing Analysis & Elaboration which I think is related to my problem. Warning: Ignored assignments for entity "test" -- entity does not exist in design. 'test' is the top-level entity.  I had successfully compiled my design using incremental synthesis, but since changing the top-level entity by going into Assignments -> Device... -> General, my design no longer compiles. The top-level entity had been 'out', which is now a sub-module of 'test'.  Since making this change, I am not able to expand the top level entity in the hierarchy tab of the Project Navigator. I have a file named test.v which contains a module called 'test'. This file is listed under Device Design Files in the Files tab of the Project Navigator.  I am using Quartus II v 5.0.

[Altera_Forum]

I solved the problem by switching the top-level entity from 'test' back to 'out', unchecking 'set as design partition' for each partition, compiling, changing the top-level entity from 'out' to 'test', compiling, checking 'set as design partition' for each partition again, and re-compiling.