bobj error on Crystal Report

bobj.crv.stateManager.setComponentState('rptVehicleHistory__UI',eval('('+document.getElementById('__CRYSTALSTATErptVehicleHistory').value+')'));

Hi, 
I'm getting bobj unidentified error message whenever I run my program and want to print report from crystal report.

Can you please help me with this?

Thanks in advance.