GEM_HOME and/or GEM_PATH not set

[hron84]

gem stdout: Nothing written
gem stderr: Warning: PATH set to RVM ruby but GEM_HOME and/or GEM_PATH not set, see:
    https://github.com/rvm/rvm/issues/3212

Warning! PATH is not properly set up, $GEM_HOME is not set.
         <log>Usually this is caused by shell initialization files. Search for <code>PATH=...</code> entries.
         You can also re-add RVM to your profile by running: <code>rvm get stable --auto-dotfiles</code>
         To fix it temporarily in this shell session run: <code>rvm use ruby-2.5.6</code>
         To ignore this error add <code>rvm_silence_path_mismatch_check_flag=1</code> to your <code>~/.rvmrc</code> file.