Diễn Đàn VPSSIM - How To Use VPSSIM & VPS/Server

Nginx has an error. VPSSIM can not run this function !
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Nginx status: 
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nginx: [warn] "ssl_stapling" ignored, issuer certificate not found for certificate "/etc/nginx/paidssl/xxx.vn/xxx.vn.crt"
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

ssl_stapling on;
ssl_stapling_verify on;