Error when trying to decompile

[User670]

PHP Warning:  include(vendor/autoload.php): Failed to open stream: No such file or directory in D:\Software\decompile jsc\run.php on line 8
PHP Warning:  include(): Failed opening 'vendor/autoload.php' for inclusion (include_path='.;C:\php\pear') in D:\Software\decompile jsc\run.php on line 8
PHP Fatal error:  Uncaught Error: Class "Irelance\Mozjs34\Decompile" not found in D:\Software\decompile jsc\run.php:11
Stack trace:
#0 {main}
  thrown in D:\Software\decompile jsc\run.php on line 11```