Hi @aanku 

Standard Acumatica does not see the "Contact cannot be empty" error message when saving "Project templates".

Please check to see if Customization is causing this error ?

Best Regards,

NNT

Thanks @nhatnghetinh for your reply!

Yes! there are couple of customizations for PM screen, I tried unpublish but, the same error still continue exist. 

@aanku Can you please attach screenshots and the details on the project template you are trying to save?