problem Kendo UI grid getting data from Dynamics CRM

Question

Hello every one,

I have a strange problem getting data from Dynamics CRM online into a kendo UI data grid , when I inspect with chrome browser, I get sometimes this error

 

XMLHttpRequest cannot load https://cynapsyscrm.api.crm4.dynamics.com/api/data/v8.1/accounts?%24top=20. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4563' is therefore not allowed access. The response had HTTP status code 401.

 

but when I use CORS this error disappear and I get new error indicating that the request is UNAUTHORIZED 401, 

 

Please help me with this error, in attachment you find my source code

THANKS A LOT