I developed a new report for account.invoice in odoo 14 but upon printing here is the error:
The report's template 'NEW INVOICE' is wrong, please contact your administrator.
Can not separate file to save as attachment because the report's template does not contains the attributes 'data-oe-model' and 'data-oe-id' on the div with 'article' classname.
Solution: Dont forget to add t t-set="print_custom" t-value="True"/> in the report_invoice_custom you created
The title of your question is not related to your issue, please use a meaningful title. Also, without any further information, there is not more to say as already stated in your error message. Please read the developer documentation and look at the existing reports.