In AN12327SW‘s folder ，when I was double click the post_build_mdk.bat，and it caused an error,like this :
Incorrect image signature.I don't know why this mistake happened,so I want to ask you how to solve this problem.
And after that ,I continue with the instructions above for AN12327.Probably because of the mistake above,when I was excuting the file of flash_program.bat,it also causes a mistake like this.
ERROR：UartPeripheral（） can not open PC UART port (COM4) ,speed(57600hz).
I believe this mistake was caused by the mistake above。So I want to know how to solve the problem above, thank you very much！
