“Error” message creates a pop-up [esaggs]>

if I am ideal for more than 10 minutes and then try to interact Dashboard then I am getting a error pop up msg in my widget.
I am using kibana v 7.10

Can you check your Kibana logs and your browser's console for errors?

Refused to apply style from bundles/kbn-ui-shared-deps/kbn-ui-shared-deps.css' because its MIME type ('application/json') is not a supported stylesheet MIME type, and strict MIME checking is enabled. manifest.json:1

I have applied custum css in advance setting > visualisation > color mapping.