error "qsRules is null or not an object"

Hey guys, i am trying to call qsrules in html file but it gives me this error

qsRules is null or not an object

when it goes to second line of code

var qsRules = qsBridge.RequestQSRules(); var rs = qsRules.OpenRecordSet(sql, true);

can anybody tell me what i might be doing wrong

thanks a lot shoby