Upgrade my App 2013 R2 to 2014 R2.1 Fails

Targets Web
1

my app web is work perfectly in 2013 R2, but with 2014 R2.1 Fails and display error
what is wrong, if my application works well with the previous version

2

you call set visible too early.
The control has not yet arrived in browser.

3

Also - clear your browser cache. That has caused me issues many times when updating versions of code.

4

the problem was that the WebGrid v2 is not compatible with the latest versions of XOJO