I want to call the REST endpoint and return the list of objects. I`ve created the method but it displays an error: 
<METHOD DOES NOT EXIST>GetAllPersons+10^Lab3.RestClient.1 *Count,%ZEN.proxyObject

ClassMethodAs%Status

Here is an example of a rest call via ARC:

Not sure if  %ConvertJSONToObject is used properly but I did not find another

I need to create a simple REST application.
I`ve created an app:

Also here is a dispatcher class:
 

ClassExtends%CSP.REST0

But when I call the Get method: http://localhost:52773/csp/crud/hello
There is an error: 403 Forbidden
I don't understand what can cause it.