Heroku client internal error

[shoaib-iqbal]

I have installed new heroku cli wget -qO- https://toolbelt.heroku.com/install-ubuntu.sh | sh
on Ubuntu 14.04, I am gettig this error when checking heroku --version.
` ! Heroku client internal error.
! Search for help at: https://help.heroku.com

Error:       undefined method `length' for nil:NilClass (NoMethodError)
Command:     heroku login
Version:     heroku-gem/3.99.1 (x86_64-linux) ruby/2.3.0
Error ID:    c5991ea9aaaa4c548af66c1befce36bf

More error detailsHeroku client internal error.
undefined method length' for nil:NilClass /home/irfan/.rvm/gems/ruby-2.3.0/gems/heroku-3.99.1/lib/heroku/auth.rb:188:in read_credentials'
/home/irfan/.rvm/gems/ruby-2.3.0/gems/heroku-3.99.1/lib/heroku/analytics.rb:53:in user' /home/irfan/.rvm/gems/ruby-2.3.0/gems/heroku-3.99.1/lib/heroku/analytics.rb:33:in skip_analytics'
/home/irfan/.rvm/gems/ruby-2.3.0/gems/heroku-3.99.1/lib/heroku/cli.rb:27:in start' /home/irfan/.rvm/gems/ruby-2.3.0/gems/heroku-3.99.1/bin/heroku:26:in <top (required)>'
/home/irfan/.rvm/gems/ruby-2.3.0/bin/heroku:22:in load' /home/irfan/.rvm/gems/ruby-2.3.0/bin/heroku:22:in

'
/home/irfan/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in eval' /home/irfan/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in '
`

[jdx]

The CLI is installed as the old legacy gem and is crashing. You need to uninstall the gem or change your path to include the CLI