Error Facebook Login

i use unity4.6 and a facebook SDK 4.3.6
WHEN I TRY TO login i have this error :

1)
Unable to verify assembly data; you must provide an authorization key when loading this assembly.
UnityEngine.Security:LoadAndVerifyAssembly(Byte[])
<LoadFacebookClass>c__Iterator0:MoveNext() (at Assets/Facebook/Scripts/FB.cs:326)

2)
Could not securely load assembly from https://integrated-plugin-canvas-rsrc.fbsbx.com/rsrc/unity/lib/sdk_4.0/CanvasFacebook.dll
UnityEngine.Debug:LogError(Object)
FbDebug:Error(String)
<LoadFacebookClass>c__Iterator0:MoveNext() (at Assets/Facebook/Scripts/FB.cs:329)

please help me

this question is closed
i update my facebook sdk to a new version (4.3.6 to 6.1.0)

Another solution is:

– > open fb.cs
→ Look for #if !UNITY_WINRT
→ Below it is another #if which looks like #if UNITY_4_5
→ In that line add “|| UNITY_5_3” or whatever version you are using. e.g UNITY_5_1 for unity version 5.1 or so on.

Hope it helps.