Error with promise on mac

[FBerthelot]

Hello,
I cannot launch my test anymore and i don't know why.

This is the full log Error :

=======================================================================================
Selenium 2.0/webdriver protocol bindings implementation with helper commands in nodejs.
For a complete list of commands, visit http://webdriver.io/docs.html. 
=======================================================================================

[10:58:07]:  COMMAND    POST     "/wd/hub/session"
[10:58:07]:  DATA                {"desiredCapabilities":{"browserName":"chrome","version":"","javascriptEnabled":true,"locationContextEnabled":true,"handlesAlerts":true,"rotatable":true,"platform":"ANY","loggingPrefs":{"browser":"ALL","driver":"ALL"},"requestOrigins":{"url":"http://webdriver.io","version":"3.2.4","name":"webdriverio"}}}
[10:58:09]:  SET SESSION ID 66890078-5021-4aa7-9e6b-daeb67fc4600
[10:58:09]:  RESULT              {"platform":"MAC","acceptSslCerts":true,"javascriptEnabled":true,"browserName":"chrome","chrome":{"userDataDir":"/var/folders/sr/_w_pbl194d97179lx2gxzkhh0000gn/T/.org.chromium.Chromium.DaB1Rl"},"rotatable":false,"locationContextEnabled":true,"mobileEmulationEnabled":false,"webdriver.remote.sessionid":"66890078-5021-4aa7-9e6b-daeb67fc4600","version":"45.0.2454.93","takesHeapSnapshot":true,"cssSelectorsEnabled":true,"databaseEnabled":false,"handlesAlerts":true,"browserConnectionEnabled":false,"nativeEvents":true,"webStorageEnabled":true,"hasTouchScreen":false,"applicationCacheEnabled":false,"takesScreenshot":true}

/Users/berthel/developpement/pro/infopro/salto-ihm/node_modules/webdriverjs-angular/node_modules/webdriverio/lib/utils/PromiseHandler.js:154
                throw error;
                ^
RuntimeError: RuntimeError
     (UnknownError:13) An unknown server-side error occurred while processing the command.
     Problem: POST /session//url
Build info: version: '2.47.1', revision: '411b314', time: '2015-07-30 03:03:16'
System info: host: 'berthels-mac.info.local', ip: '172.20.232.176', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '10.10.5', java.version: '1.7.0_79'
Driver info: driver.version: unknown

     Callstack:
     -> url("about:blank")



0 passing (20.70s)

Apparently there is a callback missing but i don't know where.