user tagging

I'm getting this kind of error. What is the reason when sending a profile message?

XenFun submitted a new resource: [DBTech] DragonByte User Tagging - Allow members to use hash tags in posts and tag users in threads. Read more about this resource...

Uses The DragonByte User Tagging mod adds multiple new features to your site, including extending the user mention feature to also work for user groups (auto-complete enabled). It also adds the ability to add Twitter-style hashtags to your posts, with auto-complete for existing hashtags used by...