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CCS/TM4C1297NCZAD: CORTEX_M4_0: Error: Debug Port error occurred

Part Number: TM4C1297NCZAD

Tool/software: Code Composer Studio

I almost have my development environment set up with Code Composer 6.2.0.00050 and the TM4C129X Development Board connected to our controller board.  I am able to build the code and download it to the target without any problems (as far as I am aware).  I can also start running the code, but then I get these messages.

CORTEX_M4_0: Error: Debug Port error occurred

CORTEX_M4_0: Trouble Halting Target CPU

Any ideas where to look?