Error parsing database key file. At line <line_number>: <line_contents> does not start with 'dat' / 'key'

Error parsing database key file. At line <line_number>: <line_contents> does not start with ‘dat’ / ‘key’

Plugin error: The plugin detected that the master key file was not properly formatted.

Action: Verify entries in the master key file start with “dat” or “key”.