Antlr - Object reference not set to an instance of an object

Does anyone know anything about how Antlr works? I'm getting an error on a dev server:

[NullReferenceException: Object reference not set to an instance of an object.] Antlr.StringTemplate.CommonGroupLoader.LocateFile(String filename) +19 Antlr.StringTemplate.CommonGroupLoader.LoadGroup(St开发者_StackOverflow社区ring groupName, StringTemplateGroup superGroup, Type lexer) +67

The same exact code works fine locally and I can see antlr.runtime.dll in the bin folder on the dev server.

Thanks for any guidance, I've never worked with Antlr before, Justin

It ended up being that Publish wasn't including the EmailTemplates folder...