A Runtime Error has occurred while working on ArcGIS desktop

Hi guys,
I am posting here an error while I encountered while working on ArcGIS desktop, when I am in the middle of my work, an error message came across my screen, pasted below the screenshot of the error.
A Runtime Error has occurred.
Do you wish to debug?
Line: 39
Error: Object doesn’t support this property or method
The above error only occurred this time, that is why this scenario is new to me, what I did, I shut down my computer a have it rest for a while, because I notice its temperature is getting high, after an hour I turned ON the computer and back to my work using ArcGIS desktop, bust same error persisted,
Please share some comments on my post,
Thanks a lot
