Warning: file_get_contents(http://app.artmuseum.pl/api/site.php?site=callofpapers): failed to open stream: HTTP request failed! HTTP/1.0 500 Internal Server Error in /app/Common.php on line 20

Fatal error: Uncaught TypeError: Argument 1 passed to recursiveFind() must be of the type array, null given, called in /app/Common.php on line 24 and defined in /app/Common.php:71 Stack trace: #0 /app/Common.php(24): recursiveFind(NULL, 'type', 11) #1 /system/bootstrap.php(103): require_once('/app/Common.php') #2 /public/index.php(36): require('/system/bootstr...') #3 {main} thrown in /app/Common.php on line 71