Does anyone have any insight to this?
How would that even be possible?
First - this forum is for Java questions or issues.
Second - your complaint is about an ant or ant configuration file issue but you don't bother to post ANYTHING related to ant or the file ant is trying to execute.
Repost your problem in an Ant support forum. When you do, anyone that wants to help you will need the details about what you are trying to do and the contents of the file you are trying to do it with.
> it is included in my classpath
Presumably you mean that you have an environment variable called CLASSPATH.
As far as I can recall Ant constructs its own class path. Everything else probably works because the Ant files has the correct information on the class paths for everything else.