Problems with viewing my calendar

Hey dudes,

i'm trying to build a small calendar into my app. I follow the steps shown in #213 Calendars - RailsCasts, so i go with the table_builder gem, which allows to use the calendar_for command. But unfortunately it doesnt work or rather show the results in my view-template. I even got no error-message. It only shows this: (twice!!?!)

Calendar < March 2011 > <th>Sonntag</th><th>Montag</th><th>Dienstag</th><th>Mittwoch</th><th>Donnerstag</th><th>Freitag</th><th>Samstag</th><th>Sonntag</th><th>Montag</th><th>Dienstag</th><th>Mittwoch</th><th>Donnerstag</th><th>Freitag</th><th>Samstag</th>

Ok here's my Code (btw. i use Rails 3.0.4 and 1.8.7-p330):

Controller: