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Hi @MerseyRay, It's problaly not realted to that module.

I just had this problem and fixed it like this:

1. Restore backup to 1.7.8.10
2. Go to "Design > Theme & Logo" and select the Classic as the active theme.
3. Clear the "var/cache" folder (remove the dev & prod folders).
4. Disable the "Switch to the default theme" option in the 1-Click Upgrade module.
5. Update it again.

Make sure the "Switch to the default theme" is disabled before you click the upgrade button. sometimes it goes back to enable by itself.

Hi @MerseyRay, It's problaly not realted to that module.

Try this:

1. Restore backup to 1.7.8.10
2. Go to "Design > Theme & Logo" and select the Classic as the active theme.
3. Clear the "var/cache" folder (remove the dev & prod folders).
4. Disable the "Switch to the default theme" option in the 1-Click Upgrade module.
5. Update it again.

Make sure the "Switch to the default theme" is disabled before you click the upgrade button. sometimes it goes back to enable by itself.