Hey all, am trying to generate an answer file using WSIM and after selecting a windows image (.wim) its start to generate the catalog and it gives an error on the "cleaning up" phase of it (see pic) Also i have uploaded the error log file. 11:11 AM : 11:11 AM : Windows SIM was unable to generate a catalog. For troubleshooting assistance, see the topic: 'Windows System Image Manager Technical Reference' in the Windows OPK or Windows AIK User's Guide. 11:11 AM : 11:11 AM : System.InvalidOperationException: The operation failed to complete. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentNullException: String reference not set to an instance of a String. Parameter name: source at System.Globalization.CompareInfo.IsPrefix(String source, String prefix, CompareOptions options) at ?A0xfe36268f.ConvertToNtPath(String path) at Microsoft.ComponentStudio.ComponentPlatformInterface.CbsSessionAdaptor..ctor(String bootDrive, String imageWinDir, String servicingPath) at Microsoft.ComponentStudio.ComponentPlatformInterface.OfflineImageImpl.InitializePackages() at Microsoft.ComponentStudio.ComponentPlatformInterface.OfflineImageImpl..ctor(OfflineImageInfo imageInfo) --- End of inner exception stack trace --- at System.RuntimeMethodHandle._InvokeConstructor(Object[] args, SignatureStruct& signature, IntPtr declaringType) at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) at Microsoft.ComponentStudio.ComponentPlatformInterface.Cpi.PlatformImplementation.CreateOfflineImageIn stance(OfflineImageInfo imageInfo) --- End of inner exception stack trace --- Server stack trace: at Microsoft.ComponentStudio.ComponentPlatformInterface.Cpi.PlatformImplementation.CreateOfflineImageIn stance(OfflineImageInfo imageInfo) at Microsoft.ComponentStudio.ComponentPlatformInterface.Cpi.CreateOfflineImageInstance(OfflineImageInfo imageInfo) at Microsoft.ComponentStudio.ComponentPlatformInterface.OfflineImageCatalog.Serialize(OfflineImageInfo imageInfo) at Microsoft.ComponentStudio.ComponentPlatformInterface.OfflineImageInfo.CreateCatalog() at Microsoft.ComponentStudio.ComponentPlatformInterface.CatalogCreatorImpl.CreateCatalog(OfflineImageInfo offlineImageInfo) at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs) at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg, Int32 methodPtr, Boolean fExecuteInContext) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at Microsoft.ComponentStudio.ComponentPlatformInterface.ICatalogCreator.CreateCatalog(OfflineImageInfo offlineImageInfo) at Microsoft.ComponentStudio.CatalogGenerator.CreateCat(ProgressDialog pd, Object o) 11:11 AM : System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentNullException: String reference not set to an instance of a String. Parameter name: source at System.Globalization.CompareInfo.IsPrefix(String source, String prefix, CompareOptions options) at ?A0xfe36268f.ConvertToNtPath(String path) at Microsoft.ComponentStudio.ComponentPlatformInterface.CbsSessionAdaptor..ctor(String bootDrive, String imageWinDir, String servicingPath) at Microsoft.ComponentStudio.ComponentPlatformInterface.OfflineImageImpl.InitializePackages() at Microsoft.ComponentStudio.ComponentPlatformInterface.OfflineImageImpl..ctor(OfflineImageInfo imageInfo) --- End of inner exception stack trace --- at System.RuntimeMethodHandle._InvokeConstructor(Object[] args, SignatureStruct& signature, IntPtr declaringType) at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) at Microsoft.ComponentStudio.ComponentPlatformInterface.Cpi.PlatformImplementation.CreateOfflineImageIn stance(OfflineImageInfo imageInfo) 11:11 AM : System.ArgumentNullException: String reference not set to an instance of a String. Parameter name: source at System.Globalization.CompareInfo.IsPrefix(String source, String prefix, CompareOptions options) at ?A0xfe36268f.ConvertToNtPath(String path) at Microsoft.ComponentStudio.ComponentPlatformInterface.CbsSessionAdaptor..ctor(String bootDrive, String imageWinDir, String servicingPath) at Microsoft.ComponentStudio.ComponentPlatformInterface.OfflineImageImpl.InitializePackages() at Microsoft.ComponentStudio.ComponentPlatformInterface.OfflineImageImpl..ctor(OfflineImageInfo imageInfo) any help would be appreciated, Thanks!