UVM_ERROR @ 180000: reporter [PCKSZ] 8 bits needed to unpack integral, yet only 0 available

Hi
Am getting the error
UVM_ERROR @ 180000: reporter [PCKSZ] 8 bits needed to unpack integral, yet only 0 available
during the test execution. I came to know that this error can come when we use the unpack function. My testbench does not use the unpack function anywhere, hence am not able to debug this issue.
Can anyone throw light on what this issue can be and how to mask this error, if irrelevant?

In reply to meenu2k11:

If you do not show the relevant pieces of code it is impossible to answer your question.