GrblGru "Grbl not found @ COM5" HELP!

Projects Programming
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I am able to program my Arduino MEGA with IDE, no problem with Grbl 5x. But when I try to connect to the board in GrblGru it says "Grbl not found @ COM5". I can't figure out what the issue is but I think it has something to do with the COM port already in use. I am able to make all this work on my Arduino UNO but not the MEGA.

Any ideas as to why GrblGru can't see the program on my MEGA?

Thanks

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may be of help?

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