Internal server error

Syntax error in program /media/sf_C/Dropbox/Webs/ssl/apps/biblioteca.page.cls, line 149:

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

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

Traceback follows:

     38 *-* Call (callee) request,response -- Call our servlet!
     1427 *-* Call ListOfBooks
     3359 *-* Call Footer
     3282 *-* page~done
     149 *-* Call ParentsAndSons rs[1]~id","rs[2]~id","rs[3]~id","rs[4]~id","rs[5]~id

Original page follows: