Password reason, template installation reason, etc. The electronic invoice application system of Guangdong Provincial Taxation Bureau failed to encrypt when logging in, because the password was wrong or the password security setting was incorrect, or the encryption template was not installed successfully, which was attributed to the password reason and the template installation reason. Electronic invoice is the product of the information age. Like ordinary invoices, they are distributed to merchants in the form of unified issuance by the tax bureau. The invoice number is distributed to merchants with national unified coding and unified anti-counterfeiting technology. The signature mechanism of the electronic tax bureau is attached to the electronic invoice.