Irregularities in viewing the application in the browser

Hi,   When I try to deploy the app, I am unable to view the app as it shows in the Design mode. I get the following error in the console.  
1 answers

This looks to me as if your application was written in version 7 and you have recently migrated it to verrsion 8. 

If it was the case it may be necessary to review if and how much was the CSS modified. There was a change in the location of CSS files on the server and this may not be properly linked after the migration. It’s just an idea, based on your description is this what came to my mind.