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

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解决办法：
打开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