将写好的lua脚本存进mongo,通过查询得到脚本，运行脚本出错，找不到local cjson = require('json')中的json

local script = {}
local cjson = require('json')
function script.payloadToRowData(payloadjson,topic)
local payloadlua=cjson.decode(payloadjson)
local ntopic=string.gsub(topic,'gw','/sys/0x16')
ntopic=string.gsub(ntopic,'zclresponse','thing/event/properties')
local json={}
local value=tonumber(payloadlua['commandData'], 16)
json['state1']=value
json['topic']=ntopic
return cjson.encode(json)
end
function script.rowDataToPayload(payloadjson,topic)
local payloadlua=cjson.decode(payloadjson)
local ntopic=string.gsub(topic,'/sys/0x16','gw')
ntopic=string.gsub(ntopic,'thing/event/properties','zclresponse')
local json={}
local value=tonumber(payloadlua['state1'],10)
json['commandData']=value
json['topic']=ntopic
return cjson.encode(json)
end
return script
:2: in main chunk
[Java]: in ?]

https://blog.csdn.net/leonardo9029/article/details/51027841