message if no plans

app.js

@@ -54,9 +54,12 @@ app.get('/', (req, res) => {
 });
 
 app.get('/signup', (req, res) => {
+    let error = req.session.errMessage;
+    delete req.session.errMessage;
+    
     const ignore = ["User not found", "Incorrect password"];
-    if (ignore.includes(req.session.errMessage)) req.session.errMessage = "";
-    res.render('signup', { errMessage: req.session.errMessage });
+    if (ignore.includes(error)) error = "";
+    res.render('signup', { errMessage: error });
     return res.status(status.Ok);
 });