I install luafilesystem ,but when I run openresty is error

[zhangwei900808]

nginx: [error] init_by_lua_file error: lua/ngx_base/resty/utils/lfs_help.lua:16: module 'lfs' not found:
no field package.preload['lfs']
no file 'lua/lfs.lua'
no file 'lua/ngx_base/lfs.lua'
no file 'lua/ngx_base/resty/utils/lfs.lua'
no file 'lua/modules/lfs.lua'
no file '/usr/local/share/lua/5.1/lfs.lua'
no file '/opt/openresty/nginx/lualib/'
no file '/opt/openresty/site/lualib/lfs.ljbc'
no file '/opt/openresty/site/lualib/lfs/init.ljbc'
no file '/opt/openresty/lualib/lfs.ljbc'
no file '/opt/openresty/lualib/lfs/init.ljbc'
no file '/opt/openresty/site/lualib/lfs.lua'
no file '/opt/openresty/site/lualib/lfs/init.lua'
no file '/opt/openresty/lualib/lfs.lua'
no file '/opt/openresty/lualib/lfs/init.lua'
no file './lfs.lua'
no file '/opt/openresty/luajit/share/luajit-2.1.0-beta3/lfs.lua'
no file '/usr/local/share/lua/5.1/lfs.lua'
no file '/usr/local/share/lua/5.1/lfs/init.lua'
no file '/opt/openresty/luajit/share/lua/5.1/lfs.lua'
no file '/opt/openresty/luajit/share/lua/5.1/lfs/init.lua'
no file '/opt/openresty/site/lualib/lfs.so'
no file '/opt/openresty/lualib/lfs.so'
no file './lfs.so'
no file '/usr/local/lib/lua/5.1/lfs.so'
no file '/opt/openresty/luajit/lib/lua/5.1/lfs.so'
no file '/usr/local/lib/lua/5.1/loadall.so'
stack traceback:
[C]: in function 'require'
lua/ngx_base/resty/utils/lfs_help.lua:16: in main chunk
[C]: in function 'require'
lua/ngx_base/conf/base_config.lua:18: in main chunk
[C]: in function 'require'
./lua/nginx_init_by_lua.lua:35: in main chunk

[Tieske]

please close this issue, since you created 2 the same ones.