Facebook Android Error

Im getting this error when i import the unity facebook asset:
Please help!

Win32Exception: ApplicationName='cmd', CommandLine='/Cecho "xxx" | openssl base64', CurrentDirectory=''
System.Diagnostics.Process.Start_noshell (System.Diagnostics.ProcessStartInfo startInfo, System.Diagnostics.Process process)
System.Diagnostics.Process.Start_common (System.Diagnostics.ProcessStartInfo startInfo, System.Diagnostics.Process process)
System.Diagnostics.Process.Start ()
(wrapper remoting-invoke-with-check) System.Diagnostics.Process:Start ()
UnityEditor.FacebookEditor.FacebookAndroidUtil.DoesCommandExist (System.String command) (at Assets/Facebook/Editor/android/FacebookAndroidUtil.cs:134)
UnityEditor.FacebookEditor.FacebookAndroidUtil.get_DebugKeyHash () (at Assets/Facebook/Editor/android/FacebookAndroidUtil.cs:41)
UnityEditor.FacebookEditor.FacebookAndroidUtil.IsSetupProperly () (at Assets/Facebook/Editor/android/FacebookAndroidUtil.cs:22)
FacebookSettingsEditor.AndroidUtilGUI () (at Assets/Facebook/Editor/FacebookSettingsEditor.cs:142)
FacebookSettingsEditor.OnInspectorGUI () (at Assets/Facebook/Editor/FacebookSettingsEditor.cs:42)
UnityEditor.InspectorWindow.DrawEditors (Boolean isRepaintEvent, UnityEditor.Editor[] editors, Boolean eyeDropperDirty) (at C:/BuildAgent/work/d3d49558e4d408f4/Editor/Mono/Inspector/InspectorWindow.cs:850)
UnityEditor.DockArea:OnGUI()

if ur using windows go to computer->properties ->advance system satting->enviroment variables ->system variables->“path”(search for path in the list )

double click on path. In variable field put

C:\Windows\System32;C:\Program Files\Java\jdk1.7.0_51\bin;C:\OpenSSL\bin

press ok,ok,ok and restart unity ,ur problem will be solved if u its still have some problem then check for jdk in ur system or plz put comment in editor

i have the same problem , please help