Errors in lines 143, 147, 381, 386, 596 - is not errors, but only warnings. They occurs on new version of PHP and does not affect the execution. If you are concerned about these errors, you can download and install the fixed version from SmartResizer overview page:
iprice-web.ru/en/products/smartresizer
The real problem is this error: Error in function loadImage: That file cannot be loaded with the function 'imagecreatefromjpeg'. It is mean that your php server does not include the function "imagecreatefromjpeg". Usually this function is built-in into PHP :
php.net/manual/en/function.imagecreatefromjpeg.php .
But for some reason it does not exist on your server. You can use Google search to learn about known problems of this function on php servers.