PHP 7.0.18, Xibo 1.8.1

As far as I know, 7.0.18 is newer than 5.5. :wink:

How do I resolve this?

As discussed many times on this community forum.

PHP 7 is not supported for any current Xibo release. 1.8 series actively warns about this, and we are updating the documentation to more accurately reflect that - ie (lower than PHP7)

For now, you should downgrade the php version to 5.6.