MB51 Standard Report Giving Dump/Runtime Error

Hello All

i am facing problem to correct the standard MB51 Report.

Before mine someone has copied MB51 report and make it as a ZMB51 For the Requirement.

Now the ZMB51 is working Fine but when i try to open MB51 Report It gives me Run time Error Dump.

Please Advice me how can i correct my standard report,

Thanks in Advance.