Error occurs in Smart Form

Hi Expert,

I encounter a problem in print previewing for the smart form in the CRM Web UI, it displayed "Error occurs in Smart Form". However, the form itself is working as I am able to debug and execute it from the backend. Besides, the smart form is aimed to send through email as an attachment and the attachment is working. Just that it failed to be print preview from the CRM Web UI. Any idea?

Thank you very much for the time!

Best Regards,
Yi Ying