Hello guys, when I build my freertos stm32f0 project i found an error that says" padding struct to align 'uxDummy10' [-Werror=padded]"

Which version of FreeRTOS are you using? Which compiler are you using? Which file is the offending line in?

FreeRTOS v9 ARM GCC FreeRTOS.h

I suspect you have configMAXTASKNAME_LEN set to a value that does not end on a 4 byte alignment, but even so the compiler should then adjust the allignment of the following members, which it is apparently doing. I don't think that should be an error though, just normal behaviour, you have just set the compiler to tell you it is an error with -Werror=padded.

Now I have this problem undefined reference to vTaskStartScheduler' undefined reference toxTaskCreate' even if i included all the required headers !!!

Including the headers does not include the functions. Are you building FreeRTOS/source/tasks.c?