Grafana query drop downs not having any list

When i choose drop down list to create new dashboard grafana shows nothing its blank

I am using m3db to store data with graphite injection method when i check datasource it shows as working but nothing comes in drop down list …
When i click on that drop down list gives 400 bad request but i can get data using curl command from backend at there it works fine with m3coordinator
Please can any one help me