Assertion Failed: A helper named "_" could not be found

I tried to install a few addons like ember-light-table and ember-data-tables but their helpers don't work for me in the template. I get this error: "Assertion Failed: A helper named "light-table" could not be found"

I tried to clear all cache, tmp, etc:

npm cache clear && bower cache clean && rm -rf node_modules bower_components dist tmp && npm i && bower I

But still not working for me