4
If you've only just installed this, you would be better to remove and install 2.0.15 instead.
2.2.3 is a branch of XOOPS that, although it will still be supported, is not the ideal one to install from scratch.
(Xoops is slowly moving to a new version 2.3 - but users of 2.2 because of internal differences in the code, will have to wait longer until 2.4. Users of 2.0.15 will be able to move to the next major release more easily)