It sounds like one of your custom tagsets are borked.
Attempt to compile your custom tutorial.map one more time, and then go into your Halo CE folder (C:\Program Files\Microsoft Games\Halo Custom Edition\) and open up debug.txt. Scroll to the bottom and paste the last batch of errors here.
If it's the same, simply do some process of elimination. Start with a stock tutorial.map, add one of the custom tagsets, and attempt to compile. If it works, remove it, and do the same to the next one. Repeat until you get the failure error again.
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