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<math> problem

 
Dennis Putnam
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I have the following sequence:

The first echo generates the following as expected:

[echo] 1001 - 60286 - -

At that point the build fails on the math task. The error says, Cause: The name is undefined.

Since it is obvious that it cannot be referring to ${serialnumber}, I have no clue to what "The name" refers. Can anyone shed any light on this? TIA.
 
Dennis Putnam
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Never mind, I figured it out. I needed to add <taskdef> pointing to the ant-contrib jar which has to be installed separately.
 
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