Actually, the request successfully reached the destination server, but when it returns the client expects one kind of response, but the server returns in different format. this produces the error.
It was expecting a Json response, but it was getting empty result, that's why it was showing on the error callback though it was a successful call.
See the book OpenCart 1.4 Template Design Cookbook.
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List of my works:
- Product Based Quantity Wise Shipping: Find it here.
- OpenSSLCOMMERZ: integrate SSLCOMMERZ with opencart: Find it here.
- Fine Search v.1.0 - Improves Opencart search feature to find relevant: Find it here.
- Opensweetcaptcha - An easy way to generate attractive captcha for your system!: Find it here.
- Custom Field Product - add unlimited custom fields to the product form: Find it here.
- Formcaptcha - add captcha on the register page: Find it here.