@AllysonSouzaNopSai are you still active ? I've sent a PR addressing most of the issues reported https://github.com/terabin/flarum-ext-sitemap/pull/6
If you're not maintaining the package anymore I might consider forking it so we can get those fixes released. Would love to hear from you first though.
Out of curiosity, does anybody has the tags and pages in their sitemap with the current version of the extension ? It didn't work for me and I fixed it in the PR as well, I have no idea how it could have worked with the previous code...
Quick tip: to anybody having errors but nothing in your flarum.log
, check that php can write to the Flarum folder.