Creating QMB Missions

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I decided to try and make a QMB mission. I'm having a problem getting started.

I followed all the rules in the 4.10 Guide. When I try and load the mission in the QMB I get the following error: Data file corrupt (see attached screenshot)

All I have in the mission so far is 8 Red flights and 8 Blue flights, as required per the instructions. I'm not sure what can possibly be corrupt.

Has anyone created a more in-depth tutorial on creating QMB missions? The one in the 4.10 Guide is pretty basic.

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