Always get an:

Syntax Error in template "content:content_en"  on line 2 "{CGTweet
action=timeline}" unknown tag "CGTweet"

error when trying to call CGTweet somewhere in the frontend. When I call CGTweet
with:

{cms_module module="CGTweet"}

it all works perfect, in the forum it has been suggested this could be due to an
install problem.