Magento 1.6 Upgrade Errors with Solutions

Magento 1.6 Upgrade Errors with Solutions


After upgrading to Magento 1.6, You may face some problems like Integrity constraint violation: 1062 Duplicate entry or Error 404 after installation(while home page is OK).

1- “Integrity constraint violation: 1062 Duplicate entry “
Solution:
This error can be solved by disabling the unique indexes check.

In the app/etc/config.xml, change this

SET NAMES utf8

to this

SET NAMES utf8; SET FOREIGN_KEY_CHECKS=0; SET UNIQUE_CHECKS=0;

2. Error 404 after installation(while home page is OK)

Solution:
You will need to do one of two things:
-Refresh catalog rewrites – Admin > System > Cache > Refresh catalog rewrites. If this doesn’t work then >
-Turn off URL Rewrites – Admin > System > Web > SEO > NO

3. 500 internal error after upgraded

Solution:

CHMOD 755 the following:

- magento/index.php
- magento/downloader/
- magento/js/*

Login to Magento and clear your cache

Source: http://www.expertmagentodevelopers.com/blog/magento-1-6-upgrade-errors-with-solutions/

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