Solutions for not valid url

[umin-kyaw]

Finally I found the way to fix my error like not valid URL.

That's disable the URL of file and image in security>option of app editor.

See the photo 

 Thanks for everyone, yours suggestions to fix my errors.

https://www.googlecloudcommunity.com/gc/AppSheet-Q-A/Not-invalid-url/td-p/610004