How to customize invalidReferenceException in FreeMarker

Hi,
I badly need a help from this forum. I'm using OFBiz technology and
FreeMerkers (FTLs) are a part of it. What happens is many of the time, I'm
getting a long piece of error message on the scren render when some
invalidReferenceException occurs in the page. I want to customize these
error back trace so that the error can be displayed professionally on the
screen. How I can do that? Please help me. i'm also uploading a screen shot
for the same.

Thanx in advance,
Ajey. http://www.nabble.com/file/p14349793/freemarker_error.jpg 
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