have an startup error in require("usage-tracker') with loading usage_data.json

[monkeCode]

E5113: Error while calling lua chunk: .../nvim/lazy/usage-tracker.nvim/lua/usage-tracker/init.lua:50: Expected value but found invalid token at character 1
stack traceback:
[C]: in function 'decode'
.../nvim/lazy/usage-tracker.nvim/lua/usage-tracker/init.lua:50: in function 'load_usage_data'
.../nvim/lazy/usage-tracker.nvim/lua/usage-tracker/init.lua:549: in function 'setup'
/home/gera/.config/nvim/lua/plugins/usage.lua:1: in main chunk
[C]: in function 'require'