A QuickBooks Error Code 15101 is an indication you will usually encounter while updating the latest payroll. A missing or outdated digital signature certificate is a primary reason which invokes such an error. In this segment, we have discussed possible cases and DIY solutions in order to resolve such errors that come in QuickBooks accounting software.
Also, we’ll suggest some methods to troubleshoot QuickBooks Error Code 15101 so that you can use QuickBooks desktop without any problem.

Source: https://www.axpertadvisors.com/quickbooks-error-15101/