XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-www-data'

Hey guys,

I'm getting this error: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-www-data'.

Which I do understand has nothing to do with the module itself, as it is a problem of my server setup.

I'm using Ubuntu 18.04 LTS, with the classical LAMP setup on a remote server.

I did try to google around to find out the answer, but without any luck. So just in case anybody else has experienced the same issue (and is smarter than me to know the fix), please point me in the right direction.

Seems like the solution is trivial, but I just can't find it.

Any help is very much appreciated.

PS: Can't wait to get it working. This module looks great! - thanks for the effort.