Maintain Chart of Accounts- Access violation at address 00408758

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When accessing Maintain Chart of Accounts in one of my companies I get the following error:  Access violation at addresss 00408758 in module "Task0100.exe." Read of address 00000000.  I can access my other 2 companies with no problem.  I was in SP4 and I installed SP5 and thought it would correct the problem.