Ok I fixed the problem and I think you are going to be grateful to me ...
first to find out what really happened you need to go to the following directory:
and open in an editor the file that your browser is trying to open.
In my case it was: /report/120930661644.63
and the content of the file was:
Error in file: “D:\www\magento\app\code\core\Mage\Catalog\sql\catalog_setup\mysql4-upgrade-0.7.15-0.7.16.php” - SQLSTATE: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘ CHANGE `type_id` `type_id` VARCHAR(32) DEFAULT ‘simple’ NOT NULL’ at line 1
The “not found” is caused by your browser not being able to find this file for wahtever reason that I don t know!
As you can see it is more clearer now, the “not found” was due to a syntax error in an SQL request coming from the file magento\app\code\core\Mage\Catalog\sql\catalog_setup\mysql4-upgrade-0.7.15-0.7.16.php
The fix for this error is explained in this post:http://www.magentocommerce.com/boards/viewthread/3014/P15/
That I copied below:
@betabomber: in app\code\core\Mage\Catalog\sql\catalog_setup\mysql4-upgrade-0.7.15-0.7.16.php in statement that starts on line 35 could you please remove comma in
so it will like like this:
ALTER TABLE `catalog_product_entity`, CHANGE `type_id` `type_id` VARCHAR(32) DEFAULT 'simple' NOT NULL;
and see if it helps
ALTER TABLE `catalog_product_entity` CHANGE `type_id` `type_id` VARCHAR(32) DEFAULT 'simple' NOT NULL;
wrt to my installation, it happened twice to me for files:
I hope it will help