SITL not running properly when calling script , HELP?

Hello everyone, I trying to run this script, and have it tested out via the simulation but when i run the script i ever get a heartbeat time out or the script continually runs with the attitude being at -0 , also another problem when trying to connect to SITL , it says that I don’t have mavproxy but when i try to install it , it says its already installed . Can someone explain to me what the problem may be ?
thanks
basicmission.txt (8.0 KB)

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these are images and I included my script above