mission planner firmware is not loading!!!

hi

am very new to this topic. i installed mission planner successfully. i want to perform SIL and HIL in between mission planner and x-plane. but when am selecting firmware, it is not getting loaded . instead am getting errors like access to com port is denied or com port doesnt exist. i even tried by changing the com port in settings, but ended up with same result.

any reply from you guys will be much helpful to me.

thanks and regards

keshav3691247791?profile=original 

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