To fix QuickBooks error 6150:
You must get the QuickBooks uninstalled first and then install it again.
Also, restoring the backup can help fix QuickBooks error 6150.

Get additional assistance in fixing QuickBooks error 6150. Connect to the technical support team of QBSsolved at +18889101619 and get Error 6150 resolved or log on to https://www.qbssolved.com/ways....-to-resolve-error-61

How to Fix QuickBooks Error Code -6150 Easy Troubleshooting Steps
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How to Fix QuickBooks Error Code -6150 Easy Troubleshooting Steps

QuickBooks can have errors. One prominent error is Error 6150. If you witness error 6150 in your QuickBooks desktop.