Hi
Varshad,
As said
here:
"
There was a major outage for the AppBuilder cloud services. The good news is that our developers managed to fix it and AppBuilder should be back in its operational state now. "
Please, check if you are able to open your projects under Telerik Platform and continue your work and let us know if further issues arise. Also, please accept our sincere apologies for any inconveniences caused by the failure.
Regards,
Kaloyan
Telerik