Unable to use module after 'require' (attempt to index local 'tnt' (a boolean value))

[amdei]

This code:

local tnt = require 'tarantool'
local tar, err = tnt:new({...})

giving this error:

runtime error: /opt/lua/res_access.lua:33: attempt to index local 'tnt' (a boolean value)

as a result, module can not be used.