hardware/arduino > ls avr sam stm32 #The folder name must be **stm32**,because I hardcoded the folder name. hardware/arduino > cd stm32 hardware/arduino/stm32 > ls firmwares programmers.txt system ...

The problem is likely because you have another Java Runtime Environment installed in addition to the one that comes in the Arduino IDE. You need to update your maple_upload.bat to the one in this ...