Hello,

we have troubles to reach the CRM with the OUTLOOK add-ins. Re-installation and Re-configuration, could not solve this problem. The thing is, that it does work on some machines. After following the error message I activated the "customErrors" in the web.config. Now I shows the details, which helps NOTHING:

Server Error in '/' Application.

Culture is not supported.
Parameter name: culture
4096 (0x1000) is an invalid culture identifier.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Globalization.CultureNotFoundException: Culture is not supported.
Parameter name: culture
4096 (0x1000) is an invalid culture identifier.

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

  <%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.

Stack Trace:

[CultureNotFoundException: Culture is not supported.
Parameter name: culture
4096 (0x1000) is an invalid culture identifier.]
   System.Globalization.CultureInfo.InitializeFromCultureId(Int32 culture, Boolean useUserOverride) +14331175
   Microsoft.Crm.Application.Utility.WebClientContext.get_BrowserLanguages() +511
   Microsoft.Crm.Application.Utility.WebClientContext.get_UserLanguages() +24
   Microsoft.Crm.Application.Utility.ApplicationLanguage.GetUserLanguages(IOrganizationContext context) +27
   Microsoft.Crm.Application.Utility.CrmCultureInfo.LoadCurrentUICulture() +61
   Microsoft.Crm.Application.Utility.CrmCultureInfo.get_CurrentUICulture() +133
   Microsoft.Crm.Application.ResourceManager.BasicResourceManager.GetString(String name, IOrganizationContext context) +57
   Microsoft.Crm.Application.Controls.AppGrid..ctor(ICustomGridProviderFactory customGridProviderFactory) +112
   ASP.ikarus__controls_lookup_lookupinfo_aspx.__BuildControlcrmGrid() +37
   ASP.ikarus__controls_lookup_lookupinfo_aspx.__BuildControlTree(ikarus__controls_lookup_lookupinfo_aspx __ctrl) +52
   ASP.ikarus__controls_lookup_lookupinfo_aspx.FrameworkInitialize() +59
   System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +52
   System.Web.UI.Page.ProcessRequest() +75
   System.Web.UI.Page.ProcessRequest(HttpContext context) +70
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +502
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +197
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +88

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.2623.0

The problem appears if we want to set the relation of a e-mail or to try some other connection with the CRM. How to solve that!?

EDIT

The installation of the windows language package (German) fixed the issue for one pc. But I had to install the .cab file with lpksetup since W10 is still a beta. The other machines had already the package installed.