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The error "Object reference not set to an instance of an object" appears when the user tries to login to the system:
You get the same message when you try to set a password for the user from the console:
This can also occur when you delete the user profile from the console.
This can happen if there is no password record for the user in the database. Every user should have a password record in the table TPS_PASSWORD even if this password is blank.
Run the script attached on your database to create a blank password automatically for all the users affected by this issue.