exec_pull with http_flv error

[elvizlai]

10#10: *16 live: already publishing, client: unix:, server: 0.0.0.0:1935, session: 00007F8103473700, stream: default/cctv/test

nginx.conf

events {
    use epoll;
    multi_accept on;
    worker_connections 65535;
    multi_listen unix:/tmp/rtmp 1935;
    multi_listen unix:/tmp/h8080 8080;
}

rtmp {
    out_queue           4096;
    out_cork            8;
    max_streams         512;
    timeout             15s;
    drop_idle_publisher 15s;

    rtmp_auto_pull on;
    rtmp_auto_pull_port unix:/tmp/rtmp;

    include /etc/nginx/conf.d/*.rtmp;
}

http {
     include /etc/nginx/conf.d/*.conf;
}

conf.d/cctv.rtmp

server {
    listen 1935;

    application cctv {
        live on;

        exec_options on;

        exec_pull ffmpeg -rtsp_transport tcp -i "HIDDEN_RTSP" -vcodec libx264 -tune zerolatency -vb 400k -pix_fmt yuv420p -acodec libfaac -ab 128k -g 5 -f flv "rtmp://127.0.0.1:1935/cctv/$name" name=test;
    }
}

conf.d/8080.conf

server {
    listen 8080;

    location /live_proxy {
       flv_live 1935;
    }
}

Visit link: http://127.0.0.1:8080/live_proxy/test?app=cctv

Then using VLC Play or Web to download, the nginx log with error: 10#10: *16 live: already publishing, client: unix:, server: 0.0.0.0:1935, session: 00007F8103473700, stream: default/cctv/test