I have successfully done builds of this project before with 2018.3.0. Meanwhile, I have added a few classes in my own custom package (but not a lot of classes, this is kind of a tiny prototype project). I also upgraded to 2018.3.2. Now I'm trying to do builds - but I'm getting this super-useful error message: Oh boy ;-) I believe the relevant information is: fatal error C1060: compiler is out of heap space In builds before, I have had a different error message: LNK1318: Unexpected PDB error Googling that previous error, I found this posting on Stackoverflow, which made me assume that probably something was still left from the 2018.3.0 builds, that maybe caused trouble. So I deleted the folders Library/il2cpp_cache and Library/ScriptAssemblies. Apparently, that did fix one issue. Now, I'm also getting Unhandled Exception: OutOfMemoryException. Any ideas what's going on with this? Btw, there should be a tag "IL2CPP"!