Inconvenience encountered when closing Microsoft word

I was doing from desk, I have to used the Microsoft word for data's need to have correct spelling and some touches. While done, I save those file and close the Microsoft word program. Upon closing it an error message appears stating;
Microsoft Office has encountered a problem and cannot exit. We are sorry for the inconvenience.
To forces word to exit, End now. Any changes you made might be closed if you forced the program to exit..
To continue waiting for the program to respond, click cancel.
I just used Microsoft Word last 5 hours ago and it's working normally, since now then. What are some ways that should I do to fix this one?
