This error message usually means you are actioning a process with missing/incorrect details or a folder/record is not being recognised.
Object reference not set to an instance of an object when opening the application means that a folder in the background of the computer is not being recognised.
Object reference not set to an instance of an object when lodging information via SBR is due to a selection not been made before continuing.
Ensure when you are on the SBR settings screen that you have selected a [Lodger Type] and [Credential Type]. Also ensure your [Credentials] (MyGovID) in the Credentials drop down box have been selected.
Object reference not set to an instance of an object within the Invoice Manager section means that you have a setting switched on that is not in use.
Object reference not set to an instance of an object when you are clicking on pay Single Employee can mean that they have a duplicate custom rate set up.