Internal server error

Syntax error in program /media/sf_C/Dropbox/Webs/ssl/epbcn.com/actividades, line 1218:

     38 *-* Call (callee) request,response -- Call our servlet!

Error 97.1: Object method not found.
Object "The NIL object" does not understand message "[]".

Traceback follows:

     38 *-* Call (callee) request,response -- Call our servlet!
     1218 *-* prevn = rs3[2][1]

Original page follows: