Retrieving Trend Data via periods.lp

[hocine]

https://kb.logicmachine.net/libraries/trends/

Error in ./www/apps/data/compteur4multi/libs/compteur4multi.lua at line 45: attempt to index global 'storage' (a nil value)

i always have this issue and i don't understand my mistake  
i have this at line 45

Code:

"dependencies": {
    "lua_modules": ["storage", "trend", "grp", "json"],
    "system_version": ">=2.5.0"
  },