Project not launching despite no errors.

Here's the output when I try to debug or run:

Unhandled exception. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.NullReferenceException: Object reference not set to an instance of an object.
at GMAssetCompiler.Loader.LoadGMS2CreateAssets(String _filename)
at GMAssetCompiler.Loader.Load(String _name)
at GMAssetCompiler.Program.GetAssetsFile(List`1 _args)
at GMAssetCompiler.Program.Main(String[] _args)
at...

Project not launching despite no errors.