After installing Payroll 2.20.1, have a client with over 150 companies getting an error. Client is running Sage 100 2018.

SOLVED

The error is "A payroll tax update is available, but it cannot proceed because a payroll run is in progress in Payroll Data Entry."

I've checked every company, and the Clear button in Payroll Data Entry is disabled in all companies.

What else can I look for?

There are several backup companies that have not been converted to Sage 100 2018.  Would unconverted companies cause this problem?