Warning: Unsupported declare 'strict_types' in C:\www\inv\BaconQrCode\Renderer\Image\SvgImageBackEnd.php on line 2

Fatal error: Interface 'BaconQrCode\Renderer\Image\ImageBackEndInterface' not found in C:\www\inv\BaconQrCode\Renderer\Image\SvgImageBackEnd.php on line 20