Failed to initialize parser: Failed to read pdf: Failed to read xref table: Expected xref to start with 'xref'. Got: 40

[batnyam]

How can i import pdf template.

My code
`pdf := gofpdf.New("P", "mm", "A4", "")
tpl1 := gofpdi.ImportPage(pdf, "contract-1.pdf", 1, "")
gofpdi.UseImportedTemplate(pdf, tpl1, 20, 50, 150, 0)

var buf bytes.Buffer
err := pdf.Output(&buf)
pdf.Close()

return err, buf