Fatal error: Uncaught TypeError: Argument 1 passed to sphereVolume() must be of the type float, null given, called in /home/skilling/webappexamples.skilling.us/web/validation/functions/sphere/sphere.php on line 3 and defined in /home/skilling/webappexamples.skilling.us/web/validation/functions/sphere/sphere.php:24
Stack trace:
#0 /home/skilling/webappexamples.skilling.us/web/validation/functions/sphere/sphere.php(3): sphereVolume(NULL)
#1 {main}
thrown in /home/skilling/webappexamples.skilling.us/web/validation/functions/sphere/sphere.php on line 24