Port.c display red fork in uVision 5.28

Hi sir,
I have transplant FreeRTOSv202107.00 to STM32f103RBT6. IDE is uVision 5.28. There are red forks in port.c after build ,but in fact ,there are no errors.How to solve the problems?
Thanks!

You said there are no compiler warnings so I don’t think you have a problem. Ignore them or switch them off.

Maybe I should follow your advice . The prompt information makes me feel uncomfortable.
Thank you very much !~