help with creating an 'current' managesieve plugin

[f1outsourcing]

I hope can I post this here. I need to be able to set a flag so I can test on it and run some cronjob on the server for specific users that enabled this. Sieve rule does not need to do anything. I wanted to use managesieve for this (only way the user has access to the back end)

# rule:[Archive]
if false # true
{
        #cronjob1
}

After copying the stuf from the forward plugin I got stuck with this error message:

PHP Error: Error loading template for  in /home/login0/webmail.xxx.xxx/program/include/rcmail_output_html.php on line 749 (POST /?_task=settings&_action=plugin.managesieve-archive)

Of course changing the source so much in roundcube does not have my preference. However I cannot find a example plugin that works with 1.4 and current sieve classes.

Can someone help with this? I am willing to pay for your expenses.