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If you have a backup you could roll back to your 2.0.18 version and try the upgrade again. You could also try re-uploading the upgrade files over the existing installation. Complete the upgrade as described in the directions
here.
Check out the section of the installation/upgrade procedure in the article under this section:
Upgrading from XOOPS 2.0.* above 2.0.14 and 2.2.* (using the full package)
If you have protector installed read a couple of paragraphs above regarding necessary file placement to upgrade it.