Type search words and press enter
"Use Edit Log for transactions/masters, and digital signature for invoices/reports with Release 2.1. Download NOW!"
https://help.tallysolutions.com/docs/ts9rel54/faq/7886_c..htm

Error Code 2/4 is displayed in Tally.ERP 9 when the machine recovers from hibernation/sleep.

This error occurs only when the machine goes into hibernation/sleep. To overcome this problem change your machine hibernation/sleep settings to Never .