attempt to index local 'jwt' (a userdata value)

[dagouwang]

I used the sample you gived and there are some information

`local jwt = require "resty.jwt"

	        local jwt_token = jwt:sign(
	            "lua-resty-jwt",
	            {
	                header={typ="JWT", alg="HS256"},
	                payload={foo="bar"}
	            }
	        )
	        ngx.say(jwt_token)`

2019/08/14 03:24:05 [error] 6#6: *4 lua entry thread aborted: runtime error: content_by_lua(nginx.conf:70):28: attempt to index local 'jwt' (a userdata value)

[dagouwang]

I found that hmac.lua is needed to run this code.it's already done