Cannot rebuild PSoC Creator design after renewing Keil CA51 compiler license

Question: Why Creator is not able to build the project after renewing Keil CA51 compiler license?

 

Answer:   

   Keil creates object files when the license file is expired.  Those object files will not compile, even if you get a valid license.  Thus, if you get the error message saying that your license is expired, and renew it, your project will not build.  You must clean your project before building to make the design link.