Hello! everybody.

I have to say something first!
Because my English is bad.
I hope someone can understand my means.

I have a question.
When I start "Computer" > "Control Center" on the desktop,
the system shows error messages to me every time.
I do not know how to solve it.

Error messages:
An error occurred while loading or saving configuration information for slab. Some of your configuration settings may not work properly.
Details:
Bad key or directory name: "/desktop/gnome/url-handlers/": Key/directory may not end with a slash '/'

These are message contents.

But I use "find" and "grep" command to check it.
Don't find any about that system told me.
How to solve this problem?
I hope someone can tell me how to do.

Thanks very much!!