Fatal error: Uncaught TypeError: Unsupported operand types: string + int in /homepages/44/d90524206/htdocs/cover_generator/cover_generator.php:167 Stack trace: #0 /homepages/44/d90524206/htdocs/cover_generator/cover_generator.php(213): remove_temp_files() #1 {main} thrown in /homepages/44/d90524206/htdocs/cover_generator/cover_generator.php on line 167