Hi Aziz,
I tried it on my account and it worked. But then I deleted the application / trial instance and deployed a new one (it was a test application anyway) and I am receiving the same error now. I suspect that it's a general problem, but I guess that someone from the hanatrial team should clarify (it may be related to the underlying infrastructure, apparently apps on the s7hanaxs 'server' have this problem).
The critical flag on your application is probably due to some resource limitation (but is most likely unrelated to your problem). You can check which resource is causing the status by clicking on the Metric Details link (just below the status itself) and the checking if any of your graphs go above the red line.
Regards,
Serban