Usually, this error is caused by TeamViewer`s plug in for Outlook.
To fix this, you must first open your Outlook application,click on File tab and then go to Options,
In the new window, select Add-ins, and then click on Go.. button at the bottom of the page
After this, deselect TeamViewer Meeting Add-In click OK . When all of this is done, you can restart Outlook to finish the operation.