vb.net - Crystal Report Windows Forms Viewer : Object Reference not set to an instance on an object -

vb.net - Crystal Report Windows Forms Viewer : Object Reference not set to an instance on an object -

i working crystal reports in vb.net forms application. huge study consists of 10-12 sub-reports,there many formulas used in report, study shows "object reference not set instance on object" can't figure out, have handled exceptions well. when click "next page" button shows below dialog.

i can't figure out why happening. read many blogs, says, formula error, says, "mouse move" error.

below code have added, check now

private sub crystalreportviewer1_handleexception(byval source _ object, byval e crystaldecisions.windows.forms.exceptioneventargs) _ handles crystalreportviewer1.handleexception 'label1.text = e.exception.tostring(); 'here trap. end sub

below stack trace have found applying above code exception:

source:crystaldecisions.crystalreports.engine message:object reference not set instance of object. st: @ crystaldecisions.crystalreports.engine.reportdocument.get_isloaded() @ crystaldecisions.reportsource.nonhttpcachedreportsource.getreport(requestcontext context, boolean baddtocachewhencreated) @ crystaldecisions.reportsource.localreportsourcebase.getpage(pagerequestcontext pagereqcontext) @ crystaldecisions.windows.forms.mainreportdocument.getpage(pagerequestcontext context)

i looking solution this, anyway found issue problem , posting here.

my study had subreport , links not set main report. in scenario when seek set parameters of main study , seek load report, getting object reference error.

so either link subreport parameters main study parameter or may can seek setting sub study parameters too. have set subreport parameters link main study parameters , works.

vb.net exception crystal-reports