REST: Data service client code-generation failed: Schema specified is not valid

When I add REST Interface as a service reference in a c# projcet, an error message is shown below:

In the above message, it tells me that "Schema specified is not valid". "__x_notify_Item" is invalid"  shows that a list named "__x_notify" contains some special characters which is not accepted by the schema. 

Delete the specified list, the problem will be solved.