Mumble server not installing

Hello !
I just installed a Yunohost image on a Raspberry Pi 2, upgraded it, postinstalled it.
When trying to install Mumble Server, it starts to install, then aborts and finally it fails.
Can you help me ? Is there a bug ? French answers accepted, as I’m french.

Ok nevermind : I was trying to install it with a Welcome phrase that was not standard (contains a link to a picture, HTML tags)
After trying to reinstall with a standard “Welcome” welcome message, everything went good.
Then I just nano /etc/mumble-server.ini to put back my welcome message, and restarted the mumble service.
Everything is fine now !