Unable to add components to page

Hi ,

I am unable to add component to page even the components are allowed in design mode. The add component symbol(+ symbol) itself is not appearing . I can see only experience fragment symbol.

Also please see the screenshot  ,it is generating some error in the console log.

NOTE : I am trying to add the components using proper privileges but still no luck.

Please let me know if any idea on this issue.

Thanks,

Pallavi