I can't seem to figure out what ANT is complaining about here. All of the forum posts I've seen with this error are related to custom or nonstandard tags. I'm not doing that.
C:\XPR\XPR_JAVA\build.xml:4: Problem: failed to create task or type properties
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any <presetdef>/<macrodef> declarations have taken place.