On this page, you will find more information about the most common causes and most relevant solutions for the MapInfo Pro error 'An unknown error occurred'. Do you need help straight away? Visit our support page.
The MapInfo documentation indicates that error code 'An unknown error occurred' is caused by the following problem: "This is potentially caused by the user's lack of permissions/privileges on the machine.".
Do you think there is another cause for this error? Let others know in the comments.