HttpRequest error System.NullReferenceException

I can’t make http requests, always return error or freeze resource…

WebRequest.Create(“url”);

System.NullReferenceException: Object reference not set to an instance of an object.
  at System.Net.WebRequestPrefixElement..ctor (System.String P, System.Type creatorType) [0x00018] in <42f584362443417994ec5d5c4e2c6478>:0
  at System.Net.WebRequest.PopulatePrefixList () [0x00040] in <42f584362443417994ec5d5c4e2c6478>:0
  at System.Net.WebRequest.get_PrefixList () [0x00022] in <42f584362443417994ec5d5c4e2c6478>:0
  at System.Net.WebRequest.Create (System.Uri requestUri, System.Boolean useUriBase) [0x0002e] in <42f584362443417994ec5d5c4e2c6478>:0
  at System.Net.WebRequest.Create (System.String requestUriString) [0x00014] in <42f584362443417994ec5d5c4e2c6478>:0
  at LauncherApi_server.SocketClient.ConnectToNamespace (System.String nsp) [0x00000] in <05f63b595a49472dbf32f4b7c3cc3b56>:0

Please Help me!

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