Fatal error: Uncaught Error: Interface 'JsonSerializable' not found in /home/jimmygil/public_html/progwmj/sysexp/system/src/Grav/Common/Data/Data.php:30
Stack trace:
#0 /home/jimmygil/public_html/progwmj/sysexp/vendor/composer/ClassLoader.php(576): include()
#1 /home/jimmygil/public_html/progwmj/sysexp/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/home/jimmygil/...')
#2 [internal function]: Composer\Autoload\ClassLoader->loadClass('Grav\\Common\\Dat...')
#3 /home/jimmygil/public_html/progwmj/sysexp/system/src/Grav/Common/Config/Setup.php(28): spl_autoload_call('Grav\\Common\\Dat...')
#4 /home/jimmygil/public_html/progwmj/sysexp/vendor/composer/ClassLoader.php(576): include('/home/jimmygil/...')
#5 /home/jimmygil/public_html/progwmj/sysexp/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/home/jimmygil/...')
#6 [internal function]: Composer\Autoload\ClassLoader->loadClass('Grav\\Common\\Con...')
#7 /home/jimmygil/public_html/progwmj/sysexp/system/src/Grav/Common/Service/ConfigService in /home/jimmygil/public_html/progwmj/sysexp/system/src/Grav/Common/Data/Data.php on line 30