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%E-P4128501-P2LZTXIX_BND_ZONE_ALLOCS_LIST, , , An integer string of zero length is requested.

I am getting this error:
%E-P4128501-P2LZTXIX_BND_ZONE_ALLOCS_LIST, , ,                 
    An integer string of zero length is requested.  
 
Does anybody have an idea of how to solve it or where can I look for a mistake?
 
I have reviewed the entire code (.bdf and .dat) and compared it with other similar which works well but couldn't find big differences.
 
Thanks for your answers