hi @Abyl_Ikhsanov !!
Welcome to our community 
This error usually indicates a lack of resource from the server side.
I see you are using our cloud. For any issues like this, the best place to ask for support is following this page inside your console
How many objects are you currently hosting and how many objects do you plan on hosting?
if you are using a sandbox, be aware that it has a limited resource allocated for it.
Let me know if this helps.
Thanks!