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https://help.tallysolutions.com/docs/te9rel61/Error_warning_message/Licensing_1.htm

Silver License with serial number “XXXXXXXXX” is in use on “system name”. Exit all instances of Tally.ERP 9 and try again.

Cause

This error occurs when more than one user try to access the same single user license at the same time.

Solution

To access a single user license from a different system, close the Tally.ERP 9 instance that is currently accessing the license.