Notice: Undefined index

Introduction

This error appears when you call a variable that has not been declared: it can be a bug or a wrong modification.
Notice: Undefined index varname in /home/yoursite/public_html/vqmod/vqcache/somestring.php on line xxx
That's a typical message displayed when vQmod™ is not installed, not installed correctly or not working (you'll read vqmod/vqcache in the path).
Our Browse our OpenCart themes work using vQmod™, an override system designed to avoid having to change core files.
PHP Notice: Undefined variable: product_id in /path/public_html/catalog/controller/module/name of the module.php on line 149
That's a typical message displayed if you installed an extension with a bug.

Solutions

Here are the steps you can follow:

Official Documentation

You can browse vQmod Official Thread to read more.
Help Topics: Support | Last updated 23 Apr 2014

OpenCart Common Errors
other FAQs

  1. 500 Internal Server Error or Blank White Page
  2. Allowed Memory Size Exhausted
  3. Headers already sent
  4. Notice: Undefined index
  5. Notice: Undefined index: count in
  6. Solving vQmod Error 500
  7. vQmod does not work after updating an OpenCart installation
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