Plugin install help

[shearer]

Hey

i need some help here. i am trying to install some kolab stuff on the newest version of RC

i upload the plugins to the pludins folder. Go to main.inc.php and past the plugin name. And then goes to settings, but i cant see the things i just uploaded.

Do i miss something or ?

this work fine
$rcmail_config['plugins'] = array('html5_notifier');
But when i make the changes like this
$rcmail_config['plugins'] = array('html5_notifier', 'tasklist');

i cant load roundcube page anymore. ?

[alec]

Most likely the plugin you get is not compatible with Roundcube version you have. See error log.

[shearer]

this is my error log ?
[12-Jun-2013 14:31:30 +0200]: PHP Error: Failed to load plugin file /home/public_html/rc/plugins/libcalendaring/libcalendaring.php in /home/public_html/rc/program/lib/Roundcube/rcube_plugin_api.php on line 223 (GET /rc/?_task=mail&_mbox=INBOX)
[12-Jun-2013 14:31:30 Europe/Berlin] PHP Fatal error:  Class 'libcalendaring' not found in /home/public_html/rc/plugins/tasklist/tasklist.php on line 67
[12-Jun-2013 14:31:32 +0200]: PHP Error: Failed to load plugin file /home/public_html/rc/plugins/libcalendaring/libcalendaring.php in /home/public_html/rc/program/lib/Roundcube/rcube_plugin_api.php on line 223 (GET /rc/?_task=mail&_mbox=INBOX)
[12-Jun-2013 14:31:32 Europe/Berlin] PHP Fatal error:  Class 'libcalendaring' not found in /home/public_html/rc/plugins/tasklist/tasklist.php on line 67

i use plugins from roundcubemail-plugins-kolab-3.0.1.tar.gz   ?