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Can not upgrade to

Can not upgrade to

I started the process of upgrading magento from 1.8 to and I used downloader for this it.

At the end of the process I saw this error :


ONNECT ERROR: Failed to open file /home/unitedbro/public_html/downloader/.cache/community/Interface_Adminhtml_Default-
Failed to open file /home/unitedbro/public_html/downloader/.cache/community/Interface_Frontend_Rwd_Default-


and I see this error in error_log :


[26-Jun-2017 16:03:06 UTC] PHP Fatal error: Call to a member function isLockExists() on a non-object in /home/unitedbro/public_html/app/code/core/Mage/Index/Model/Lock.php on line 257


I tried clearing cache but it didn't help.



Re: Can not upgrade to

Hi, if you are unable to get the downloader to work, you could try downloading manually from and moving the files into place instead. You will need to ensure that you don't delete folders/files from customisations that you need to keep. 

If you've found one of my answers useful, please give "Kudos" or "Accept as Solution" as appropriate. Thanks!