I try to use JSON in Lua – I am completely new to Lua.

My code (test.lua)

local json = require ("json")
print "hello"

My install (Debian 12)

# luarocks install luajson

Installing https://luarocks.org/luajson-1.3.4-1.src.rock    
luajson 1.3.4-1 depends on lua >= 5.1 (5.1-1 provided by VM)
luajson 1.3.4-1 depends on lpeg >= 0.8.1 (1.1.0-1 installed)
Do not use 'module' as a build type. Use 'builtin' instead.
luajson 1.3.4-1 is now installed in /usr/local (license: MIT/X11)

My output after

 # lua test.lua

is this

lua: /usr/local/share/lua/5.1/json/decode/util.lua:97: attempt to call field 'version' (a string value)
stack traceback:
    /usr/local/share/lua/5.1/json/decode/util.lua:97: in main chunk
    [C]: in function 'require'
    /usr/local/share/lua/5.1/json/decode.lua:12: in main chunk
    [C]: in function 'require'
    /usr/local/share/lua/5.1/json.lua:5: in main chunk
    [C]: in function 'require'
    awattar.lua:6: in main chunk
    [C]: ?

Whats the problem here?