F:\SMOG\Kepler\workspace\ModelDifference\Launch_MMD2ATL.xml:49: Problem: failed to create task or type am3.loadModel
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.
I recommend you to use the latest version of the ATL ANT tasks.
Also, when you define the launch configuration to run your ANT build, you have to select "Run in the same JRE as the workspace" from the JRE tab.