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https://help.tallysolutions.com/docs/te9rel61/Licensing/Error_Code_6405.htm

Error Code 6405: Incorrect password. Enter correct password to proceed.

Cause

This error occurs when you enter an incorrect password.

Solution

You must enter the correct password. If you do not remember the password, press F5: Reset Password, a link will be sent to your e-mail ID to reset your password.