Class 'setasignpdipdftpl' not found

unable to find pdf file header fpdi
uncaught error: class 'setasignfpdifpdi' not found in
this pdf document is encrypted and cannot be processed with fpdi
class 'fpdf' not found
fpdi example
namespace setasign fpdi
fpdi laravelfpdi documentation

Fatal error: Uncaught Error: Class 'setasignFpdiFpdfTpl' not found in C:LandawebcolomboTurneroserverldnewendorsetasignpdisrcFpdi.php:24 Stack.This file is part of the package setasign/fpdi. Please go to our download page to download this composer package and to solve the problem class 'FpdfTpl' The class FpdfTpl was build as an intermediate class between FPDF and FPDI in the past. In version 2 this class was implemented for backwards-compatibility.