How to increase error limit in Visual Studio?

I don't think so. VS basically reports all errors it encounters during compilations. There might be some erroneous parts of the code that make the compiler getting caught in an infinite "error" loop.

The limit was implemented to avoid that. In most cases the 100 errors you get are just the same error reported over and over again. What would be the sense in increasing the number of repetitions?

Maybe you can post the code snippet where the error occurs first, so we can help you fix it.