Sales order is not invoiced and didnt show any error message.

I have created a salesorder and when I am going to Invoice it.It didn't invoiced and didn't show any error message.

During the debugging I got the stack trace error message on

Debug::assert(currentTransaction == _custVendTrans);

both the currentTransaction and _custVendTrans contains the same values.

Below is the stack trace error:

Debug asserton failed.

stack trace:

classes\custVendTransDistributionController\generateDistributions -line52
Classes\CustVendSettle\postingProfileSettle_CreateDistributions -line 53
classes\CustVendSettle\settleForDifferentProfilesOrPrepayment - line 433
Classes\CustVendSettle\SettleNow -line 739
Classes\custVendTransData\updateoffsetVoucher -line 97
Classes\CustVendVoucher\post -line 678
Classes\CustVoucher\post -line 44
...
Classes\SysOperationServiceController\runOperationWithRunAs- line 7
Classes\SysOperationServiceController\run - line 3
Classes\SalesFormLetter\run -line 76
Classes\SalesFormLetter_Invoice\run -line 6
Classes\SalesFormLetter\main -line 100
Classes\FormFunctionButtonControl\Clicked

Does any one have any idea why its not invoicing?