How can I get rid of this ruby ​​warning?

Question

I just installed ruby ​​1.9.1-p429 with macports. Every time I use it, it displays this error message:

$ ruby1.9 -e "puts 'hi.'" Error loading gem paths on load path in gem_prelude can't modify frozen string <internal:gem_prelude>:69:in `force_encoding' <internal:gem_prelude>:69:in `set_home' <internal:gem_prelude>:38:in `dir' <internal:gem_prelude>:76:in `set_paths' <internal:gem_prelude>:47:in `path' <internal:gem_prelude>:286:in `push_all_highest_version_gems_on_load_path' <internal:gem_prelude>:355:in `<compiled>' hi. 

Answer 1

This is a bug: see bug report here

I don't know if it is available from either MacPorts, but Ruby 1.9.1-p378 and 1.9.2-rc1 are freed from the problem.

If you have not tried this yet, I highly recommend rvm for several Ruby interpreters.