As shown in the picture below, only the main.c file in the project turned gray. Everything else is fine. What's the problem?

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As shown in the picture below, only the main.c file in the project turned gray. Everything else is fine. What's the problem?

Hello,
Please specify the exact CCS version being used.
As shown in the picture below, only the main.c file in the project turned gray.
Was this the case with this file from the start? Or did this all of a sudden happen recently?
Thanks
ki