Error 'Unknown encoding'

[alancd]

$ totoro -c "utf8"
info handle-cfg.js:203 | Found runner < /Users/Alan/Projects/avalon.test/tests/runner.html >

buffer.js:434
      throw new Error('Unknown encoding');
            ^
Error: Unknown encoding
    at Buffer.toString (buffer.js:434:13)
    at Object.fs.readFileSync (fs.js:236:33)
    at findRunnerRoot (/usr/local/lib/node_modules/totoro/lib/handle-cfg.js:113:20)
    at handleClientRoot (/usr/local/lib/node_modules/totoro/lib/handle-cfg.js:74:22)
    at handleCfg (/usr/local/lib/node_modules/totoro/lib/handle-cfg.js:38:3)
    at new Client (/usr/local/lib/node_modules/totoro/lib/index.js:24:14)
    at Object.<anonymous> (/usr/local/lib/node_modules/totoro/bin/totoro:77:21)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)

[alancd]

runs ok after upgrade nodejs and packages