“Some of the projects in the active BlackBerry configuration contain errors. Project MobileRDM contains errors (Please check the Problems view). “ or “running the rapc utility error” Errors in eclipse Blackberry development when try to add jar file

There few ways to fix this problem here i have mentioned the method that works for me

01)Select project folder and make sure that is not read only.if it is read only remove

      the read only property

02)In the eclipse project explorer window select project then go to >build path

    >Configure Build path > Then go to > libraries and add the necessary jar files

    from add jars then order and export menu select the added jar file then press ok

Then problem will be ok