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prestashop upgrade from 1.5.6 to 1.6 failed,couldn't access both front and back office.


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I upgrade prestashop from 1.5.6.2 to 1.6 with 1-click auto upgrade,but one error happen,then i couldn't access both front and back office.

Now i make debug mode is true,the error like this.

PHP Fatal error: Class 'Collection' not found in /var/www/classes/ObjectModel.php on line 1545

I did the latest backup,but i don't know how to roll back.

Please help me to correct error .

Thanks.

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There is no class Collection in PrestaShop 1.6. Is it in a 3rd party module?

actually i don't know why this happen.just 1-click auto upgrade,now i hire a freelancer to do it.

It really need to think about whether upgrade or not.So many risk!

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