Post by jtabash » Fri May 17, 2019 5:12 am

Hi all

I am trying to upgrade my Opencart from v2 to v3. I uploaded the v3 files and i am at the install page which says upgrade step 1 of 2.

Whenever I click continue, it loads for a while then says undefined error.

Any ideas ?

Thank you



Tue Jan 05, 2016 2:08 am

Post by straightlight » Sat May 18, 2019 12:01 am

Which V3 release? More information is needed.

As for the undefined error, it may possibly be caused by the install/model/upgrade folder where one of the PHP files contains:


instead of:


By restoring backups without any extensions install and by following this FAQ afterwards: viewtopic.php?f=176&t=200804#p730051 . Everything should run smoothly.

The most generated errors being found on Opencart forum originates from contributed programming. The increased post counters are caused by redundancies of the same solutions that were already provided prior.

Straightlight Administrator / Quality Assurance Analyst / Programmer

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