Quick books EventID 4 – An unexpected error has occured in ‘QuickBooks: Returning NULL QBWinInstance Handle’
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When QuickBooks integration manager (QBi) is launched, and it tries to connect to QuickBooks, it shows a message stating: Integration Manager could not connect to QuickBooks. Please make sure that it is open. In Application section of the event viewer in Windows, it shows an error message which states: Quick books EventID 4 – An unexpected error has occured in "QuickBooks": Returning NULL QBWinInstance Handle.
The issue is caused due to .NET Framework 4.0 SP 1 on a Windows 7 computer.
To resolve the issue, please follow the steps given below:
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