odata,Duplicate properties are not allowed,REST API

Question

Hi, 

I am getting all list items from a custom list using rest api,but i am getting error like : Mutliple properties with name "Activities" exists (or)OData,Duplicate properties are not allowed.

 

In list i have only one column with name Activities(Multi line text ) in which i am storing data  in json format.Donno y the issue is arising again and again.Any ideas ??Please  help on this issue.