Update client server

GoGreen/Common/src/main/java/gogreen/common/ErrorResponse.java

@@ -0,0 +1,17 @@
+package gogreen.common;
+
+public class ErrorResponse {
+    String message;
+
+    public ErrorResponse(String message) {
+        this.message = message;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+}