no message

WarpDrinkApp/app/src/main/java/ms/itsecteam/warpdrink/dialogs/NewUserDialog.java

@@ -11,7 +11,6 @@ import android.widget.Toast;
 import ms.itsecteam.warpdrink.MainActivity;
 import ms.itsecteam.warpdrink.R;
 import ms.itsecteam.warpdrink.data.DataApi;
-import ms.itsecteam.warpdrink.data.User;
 
 public class NewUserDialog extends Dialog implements
         View.OnClickListener {
@@ -43,7 +42,7 @@ public class NewUserDialog extends Dialog implements
             case R.id.btnAddUser:
                 String username = this.txtUsername.getText().toString();
                 if (!username.equals("")) {
-                    if(!DataApi.addUser(username)) {
+                    if(!DataApi.getInstance().addUser(username)) {
                         Toast.makeText(v.getContext(),"Username ist schon vorhanden",Toast.LENGTH_LONG).show();
                     } else {
                         Toast.makeText(v.getContext(),"User angelegt",Toast.LENGTH_LONG).show();