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...