Hello i have this error when i try to reset password in FIM2010 R2 

Microsoft.IdentityManagement.CredentialManagement.Portal: System.Web.HttpUnhandledException: ScriptManager_AsyncPostBackError ---> System.TypeInitializationException: Une exception a t leve par l'initialiseur de type pour 'Microsoft.ResourceManagement.WebServices.Client.ResourceManagementClient'. ---> System.TypeInitializationException: Une exception a t leve par l'initialiseur de type pour 'Microsoft.ResourceManagement.WebServices.Client.ResourceManagementClientSection'. ---> System.InvalidCastException: Impossible d'effectuer un cast d'un objet de type 'Microsoft.ResourceManagement.WebServices.Client.ResourceManagementClientSection' en type 'Microsoft.ResourceManagement.WebServices.Client.ResourceManagementClientSection'.
    Microsoft.ResourceManagement.WebServices.Client.ResourceManagementClientSection.Create()
    Microsoft.ResourceManagement.WebServices.Client.ResourceManagementClientSection..cctor()
   --- Fin de la trace de la pile d'exception interne ---
    Microsoft.ResourceManagement.WebServices.Client.ResourceManagementClientSection.get_Instance()
    Microsoft.ResourceManagement.WebServices.Client.ResourceManagementClient..cctor()
   --- Fin de la trace de la pile d'exception interne ---
    Microsoft.ResourceManagement.WebServices.Client.ResourceManagementClient..ctor()
    Microsoft.ResourceManagement.WebServices.ResourceManager.get_SchemaManager()
    Microsoft.ResourceManagement.WebServices.ResourceManager..ctor(String typeName, LocaleAwareClientHelper localePreferences, ContextualSecurityToken securityToken)
    Microsoft.ResourceManagement.WebServices.Client.UninitializedResource..ctor(String domain, String userName, CultureInfo locale, ContextualSecurityToken securityToken, ClientOptionsHelper clientOptionsHelper)
    Microsoft.ResourceManagement.WebServices.Client.UninitializedResource..ctor(String domain, String userName, ClientOptionsHelper clientOptionsHelper)
    Microsoft.IdentityManagement.CredentialManagement.Portal.Common.ResetProxy.GetChallenge(String domain, String userName, ChallengeContext gateChallengeResponse)
    Microsoft.IdentityManagement.CredentialManagement.Portal.Common.ResetProxy.GetNextChallenge(String domain, String userName, ChallengeContext gateChallengeResponse, FaultExceptionHandlerDelegate faultExceptionHandler)
    Microsoft.IdentityManagement.CredentialManagement.Portal.Components.ResetDriver.InitiatePasswordReset(String domain, String username)
    Microsoft.IdentityManagement.CredentialManagement.Portal.Reset.MoveToAuthenticationGates()
    System.Web.UI.WebControls.Button.OnClick(EventArgs e)
    System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
    System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- Fin de la trace de la pile d'exception interne ---
    Microsoft.IdentityManagement.CredentialManagement.Portal.Site.ScriptManager_AsyncPostBackError(Object sender, AsyncPostBackErrorEventArgs eventArgs)
    System.Web.UI.ScriptManager.OnAsyncPostBackError(AsyncPostBackErrorEventArgs e)
    System.Web.UI.PageRequestManager.OnPageError(Object sender, EventArgs e)
    System.Web.UI.TemplateControl.OnError(EventArgs e)
    System.Web.UI.Page.HandleError(Exception e)
    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
    System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
    System.Web.UI.Page.ProcessRequest()
    System.Web.UI.Page.ProcessRequest(HttpContext context)
    ASP.default_aspx.ProcessRequest(HttpContext context)
    System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Any idea ? 

Thanks

Actually even few ideas :)  - http://blogs.msdn.com/b/ms-identity-support/archive/2013/01/18/fim-troubleshooting-sspr-error-3000.aspx

u must have accidentally messed up the web.config (e.g. if u backup web.config from version 1.0.0.0 and restore it on a system with version 1.0.0.1

Reinstalling SSPR Portal should fix it