wrapDescribeOperator() error while running DS

[LavanyaRamesh007]

I am trying a run a job which was working fine all these while. Suddenly I am getting a weird error-> wrapDescribeOperator() error while running DS - fatal error
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main_program: Internal Error: (status == APT_StatusOk): sc\sc.C: 3824 Fatal..error
Again if i compile and run it works fine.. again it aborts in sometime..But there are no network issues and i am not making any changes to it. Datastgae is also working absolutely fine.. Kindly help..
Job Design:
Oracle-> Transformer-> lookup-> dataset..