Error in memory allocation for even small messages.

I have my xsd schema using which i have created my standard xml.
After creating the xml i fill the values for each tag in my xml.
I get memory allocation error when i try to traverse through the xml and set the values for each tag in my xml.
I get allocation error when my program calls the setTextcontent() of xerces.It is crashing in DOMDocumentImpl.cpp allocate(size).(2nd if condition in that function)

Is there any setting that needs to be done for memory allocation? How much is the maximum size of xml that xerces can parse?how do we manage the memory allocation and deallocation in DOM?