Hi Bachir,

I should of warned. The spider plugin is only called when there are no results. Thus, the template variables, spider_results and spider_hits are only set when that occurs. To ensure that the error doesn't occur try the following:

<%if spider_results%>
<%spider_results%>
<%spider_hits%>
<%endif%>

That code will test to see if the variables have been set and if so include them into the page.

Hope this helps,
Aki