[opencms-dev] Problem in cron scheduled job for search lucene

[maria.freixes_graells at alcatel.es]

Hello everybody!!

Could anyone help to me, please?
I'm trying to use the lucene search engine. I've followed the 
instructions related in the OpenCms ebook but I've optained an error 
when I'm trying to create the scheduled job, when I put the Java class 
in the combo: net.grcomputing.opencms.search.lucene.CronIndexManager, 
then I optain the error: com/opencms/core/I_CmsCronJob, and the combo is 
setting to red colour.

Any idea about it?
Can I use the lucene search engine without using the scheduled job?

Thanks a lot, and have a nice day!!

Best regards,
Maria