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自制板载仿真器出现错误

大家好,最近仿照5529LaunchPad自制了一个板载仿真器,烧入固件以后在电脑上可以显示出虚拟端口COM,但是无法烧入程序,出现如下错误:

Error initializing emulator:
Could not set device Vcc

请问出错的原因可能是哪些,求指教,谢谢。