Trouble with Outlook. OutlookAddIn5.FormRegion1” cannot be opened.

Great day to all,
I have a scenario here about Microsoft Office Outlook, when I used it to respond to some email I meet a problem, an error message appeared on my screen, it message tells me that The form region “OutlookAddIn5.FormRegion1” cannot be opened. The form region manifest specifies an add-in that is not installed.
Microsoft Office Outlook
The form region
“OutlookAddIn5.FormRegion1” cannot
be opened. The form region manifest
specifies an add-in that is not installed.
I encountered this error when I used another computer that is not mine, I don't know what this error is all about, since I don't know what has been installed on to this computer, please help me figure out the cause of this error,
Please share your ideas,
Thanks in advance.
