Thank you Tesla for your answer. Yes, I need to set the baud rate on 115200 and I can do it. I was just wondering if the clock frequency will affect the USART communication even if we already set the proper baud rate.
Thank you guys for your feedback. Yes, I am trying to program STM32 through its evaluation board which is "H7A3ZI-Q" by Keil. There is no error when I debug the code, but I get that error when I want to send it to the microcontroller.