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Fatal error: Uncaught TypeError: realpath(): Argument #1 ($path) must be of type string, null given in /home/protected/lib/ZettelParser.php:17 Stack trace: #0 /home/protected/lib/ZettelParser.php(17): realpath(NULL) #1 /home/public/code.php(24): ZettelParser->__construct(NULL) #2 {main} thrown in /home/protected/lib/ZettelParser.php on line 17