My bad when told you that "GIJOE does not support xoops > 2.0.17 any longer"
Correct answer by GIJOE: "Sorry, I've stopped supporting core version >= 2.0.18 from xoops.org"
"version >= 2.0.18" means xoops version 2.0.18 or above.
Have a look at
this link to know the reason why GIJOE had to stop supporting xoops.