Hi there,
running Debian, I recently went from 16.09 to 18.01 via backports (I've realized since then that I probably shouldn't have done this since, to quote the update page: "Only upgrade from version N to N+1 is documented and supported"). Well, the update went well except for mod_http_upload failing to start up now with this error message:
2018-02-13 00:51:55.903 [critical] <0.1517.0>@gen_mod:start_module:212 Problem starting the module mod_http_upload for host x3mpp.net
options: [{docroot,<<"/var/run/ejabberd/http-upload">>},