String Template version vs Antlr version

[paul.c....@gmail.com]

I am using StringTemplate ST-4.1.jar with the antlr-runtime-4.7.2.jar. This generates a class loading exception for org.antlr.runtime.CharStream. When I looked at the org.antlr.runtime hierarchy, it only has org.antlr.runtime.CharStreams objects. The ST-4.1 source calls out org.antlr.runtime.CharStream.

Am I using the correct libraries?
Is there some matching of these 2 library versions I am not aware of?
If 2 is true, what antlr version do I need to use with ST-4.1?

[paul.c....@gmail.com]

however, using antlr-4.7.2-complete.jar works.