CRM 2013 Online - Form errors when opening a OOB Entity (opportunity) forms (object doesn't support property or method 'Form load')

Hi All, 

I imported one of managed solution from MSCRM 2011 online to MSCRM 2013 online, I am trying to opening a opportunity form then while loading the opportunity form "object doesn't support property or method 'Form load' error is displaying ( there is no java script libraries on opportunity form, even though the same error it is throwing), Please help on this.

Regards,

Pulla Rao Jala 

PullaRao Jala