Unable to upgrade Open Cart 3.0.3.6 from 3.0.3.3

[jameswill]

3.0.3.6

Describe the bug
While upgrading Open cart from 3.0.3.3 to 3.0.3.6 I am getting following error.

**Fatal error: Uncaught Error: Class 'Twig\Loader\ArrayLoader' not found in {PATH}/system/library/template/twig.php:31

Stack trace: #0 {PATH}/system/library/template.php(51): Template\Twig->render('common/header', '...')**

To Reproduce
Steps to reproduce the behavior:

1. Download the latest version
2. Update the new package onto existing package (backing up your config files)
3. Visit opencart installer
4. I am facing above said error.

Expected behavior
OpenCart upgrade should start on visiting installer.

Server / Test environment (please complete the following information):

• PHP version 7.3

[chongshengdz]

no database changed, upgrade is easy, just copy back 2 cofig files and third-party (custom) extensions.

[danielkerr]

ahh maybe u need to move the vendor folder from system/storage/vendor to ../../storage/vendor

[condor2]

@danielkerr reupload another 3.0.3.6 zip file. In the current one is not this fix

e0986ea

[reetp]

Happened to me using git.

Found I had to:

git clone
git checkout tags/3.0.3.6
mv upload/system/storage/vendor upload/system/storage/vendor.old

I am using PHP SCL so have to use php73 :

curl -sS https://getcomposer.org/installer | php73 -d allow_url_fopen=On
php73 -d allow_url_fopen=On  -f composer.phar install

That pulled in the correct vendor files.

Move the /upload files to your working dir.

Run install.

Once it is finished, move the contents of system/storage to opencartTmp

Carry on.

I have no idea why this works.

If you copy the temp dirs to opencartTmp first you can't run install (or upgrade)
fopen/flock/fwrite errors on system/storage/session

If you don't copy the files to the opencartTmp AFTER the upgrade you get errors from library/cache/file.php

Something odd going on.

[prabhat-webkul]

fixes are already there for https://github.com/opencart/opencart/tree/3.0.x.x_Maintenance. a new release will be there soon.