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Migration of Code to CCS5 - new errors with interrupt registers

I recently upgraded from CCS4 to CCS5. The code I am working on compiled without errors in CCS4. With CCS5, the same code gives several errors. These are the error messages:

Description Resource Path Location Type Symbol 'IER' could not be resolved inverter_main.c /Standalone Inverter line 77 Semantic Error

Description Resource Path Location Type Symbol 'IER' could not be resolved inverter_main.c /Standalone Inverter line 91 Semantic Error

Description Resource Path Location Type Symbol 'IFR' could not be resolved inverter_main.c /Standalone Inverter line 78 Semantic Error

I also noticed the following warning message:

Description Resource Path Location Type This project was created using a version of compiler that is not currently installed: 5.2.3 [C2000]. Another version of the compiler will be used during build: 6.0.2. Please install the compiler of the required version, or migrate the project to one of the available compiler versions. Standalone Inverter  properties TI Problem Marker

 

I suspect the cause of the errors is either I did not migrate the original code correctly; or there is a compiler option in CCS 5 that I need to change.

Any advice for this issue?

 

Thank you

Dale