Fix unexpected type for backend region

src/THeartbeatThread.cpp

@@ -22,6 +22,7 @@
 #include "Client.h"
 #include "Common.h"
 #include "Http.h"
+#include "RegionHandler.h"
 // #include "SocketIO.h"
 #include <nlohmann/json.hpp>
 
@@ -63,7 +64,7 @@ void THeartbeatThread::operator()() {
         for (const auto& Url : Application::GetBackendUrlsInOrder()) {
             T = Http::POST(Url + Target, Body, "application/json", &ResponseCode, { { "api-v", "2" } });
             if (T == Http::ErrorString || ResponseCode != 200) {
-                Application::TopLevelDomainFailed();
+                RegionHandler::TopLevelDomainFailed();
                 T = Http::POST(Url + Target, Body, "application/json", &ResponseCode, { { "api-v", "2" } });
             }