How to fix Adobe Acrobat/Reader Error 103:103

Hi guys, I am posting here an issue about Adobe Acrobat/Reader, while I was reading a manual on a PDF file format, I meet an error message it tells me that there is a problem with Adobe Acrobat/Reader, if it is running, please exit and try again.

Adobe PDF Document
There is a problem with Adobe Acrobat/Reader.
If it is running, please exit and try again. (103:103)
As I read the above error message, I have a problem analyzing on what went wrong, since it did state any reason for the error, what I did is just to restart my computer in hope to get rid of the error, but same error exist when I am on the middle of my reading,
Please help me with this issue,
Thanks.
