add backWithErrors() to controller

app/Http/Controllers/TableController.php

@@ -46,14 +46,17 @@ class TableController extends Controller
         // Check if table name is unique for user
         $name = $request->get('name');
         if ($u->tables()->where('name', $name)->exists()) {
-            return back()->withErrors([
-                'title' => "A table called \"$name\" already exists in your account.",
+            return $this->backWithErrors([
+                'name' => "A table called \"$name\" already exists in your account.",
             ]);
         }
 
+        // Parse and validate the columns specification
+
         // Now we create rows, a revision pointing to them, and the table using it.
 
 
+
         return "Ok.";
     }
 }