It's a known issue from Salesforce.
Check the below link for more information
https://success.salesforce.com/issues_view?id=a1p300000008YH8AAM
Logout and log in again. It worked for me.
Click "This Affects Me", so that you will get an update once the issue is resolved.
Cheers!!!
Check the below link for more information
https://success.salesforce.com/issues_view?id=a1p300000008YH8AAM
Logout and log in again. It worked for me.
Click "This Affects Me", so that you will get an update once the issue is resolved.
Cheers!!!