Error Tranmgr.900 or Linkmgr.900 or Manager.900
Upgrade to release 6.4.1 or later, and rewrite your data to resolve this issue.
While selecting a company in Tally.ERP 9, this message appears when data files are corrupted.
Back up your existing Tally.ERP 9 data.
● If you have recently taken a backup of your Tally.ERP 9 data, then restore your data and continue.
● If you have not recently taken a backup of your Tally.ERP 9 data, then rewrite your data.
If this error still appears, contact Tally Solutions.
Disable offline files on the server and client computers.