The Process class relies on proc_open, which is not available on your PHP installation

解决办法:
打开PHP配置文件 php.ini,并搜索disable_functions指令,找到类似如下内容:
disable_functions = passthru,exec,system,chroot,scandir,chgrp,chown,shell_exec,proc_get_status,popen,ini_alter,ini_restore,dl,openlog,syslog,readlink,symlink,popepassthru,stream_socket_server

找到proc_open并删除,然后重启一下php-fpm即可