ConvertTo function is not working properly. No return

[sxaxmz]

Hi, Issue with using the tool as the error is with this part of the code as the command is not made properly and its not returning.

 public function convertTo($filename)
    {
        $outputExtension = pathinfo($filename, PATHINFO_EXTENSION);
        $supportedExtensions = $this->getAllowedConverter($this->extension);

        if (!in_array($outputExtension, $supportedExtensions)) {
            throw new OfficeConverterException("Output extension({$outputExtension}) not supported for input file({$this->basename})");
        }

        $outdir = $this->tempPath;
        $shell = $this->exec($this->makeCommand($outdir, $outputExtension));
        if (0 != $shell['return']) {
            throw new OfficeConverterException('Convertion Failure! Contact Server Admin.');
        }

        return $this->prepOutput($outdir, $filename, $outputExtension);
    }

The error:

Fatal error: Uncaught NcJoes\OfficeConverter\OfficeConverterException: Convertion Failure! Contact Server Admin. in C:\xampp\htdocs\vendor\ncjoes\office-converter\src\OfficeConverter\OfficeConverter.php:54
Stack trace:
#0 C:\xampp\htdocs\a\create_thumbnail.php(136): NcJoes\OfficeConverter\OfficeConverter->convertTo('Architecture_xy...')
#1 C:\xampp\htdocs\a\create_thumbnail.php(181): getThumbnail('../uploads/ppt/...', 'Architecture_xy...', 'C:/xampp/htdocs...', '../uploads/tmp/', 'ppt', '146', Object(mysqli))
#2 {main}
  thrown in C:\xampp\htdocs\vendor\ncjoes\office-converter\src\OfficeConverter\OfficeConverter.php on line 54