Fatal error: Uncaught Error: Class "MathPHP\SetTheory\Set" not found in /home/peekizt/www/vendor/markrogoyski/math-php/src/SetTheory/ImmutableSet.php:14 Stack trace: #0 {main} thrown in /home/peekizt/www/vendor/markrogoyski/math-php/src/SetTheory/ImmutableSet.php on line 14