Hello Channa Leang,
Up to now this is the only reason for the mentioned error that we are aware of. The value that you have declared in the maxRequestLength fields estimates to 500megabytes. As far as I can see from your screenshot, you are trying to upload Visual Studio ISO file that is typically bigger that 500megabytes. Or perhaps I am missing something?
Could you please give it a tray with a larger value, for example 1024000 kbytes. If the problem persist could you please open a support ticket and send us a sample project that replicates the issue. This will greatly ease us in finding out what is going wrong.
Thank you for your cooperation.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.