Hello everybody, I hope you are going well

I am creating a diffie Hellman key exchange program, so  I am using functions like « mbedtls_dhm_init() » or « mbedtls_ctr_drbg_init() «  for example. However, even if I defined the CTR_DRBG & the DHM_C module in the config.h file, and the header in my C file, I Always have error like that :

Can someone help me to find out where does it come from ? Because I don’t know at all.

Thanks, and have a good day