Forum OpenACS Development: database error in the groups interface pages

I'm trying to create a group on a new OACS4 site,
and i get database errors from the pages:
/admin/relations/add
and
/admin/group-types/one

ERROR:  Failed to create temporary file pgsql_tmp/pgsql_tmp18695.774

I did succeed creating groups using the API (group::new ,relation_add)

the pages are failing on a select, does anyone has an idea?