This doesn't compile..

[iUltimateLP]

So another problem: This doesn't compile on my end. I get the following output (using 4.10):

1>------ Erstellen gestartet: Projekt: LazyployLauncher, Konfiguration: Development_Program x64 ------
1>  Performing 2 actions (4 in parallel)
1>  Module.LazyployLauncher.cpp
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\../GenericTask.h(71): error C2039: 'Canceling': is not a member of 'ELauncherTaskStatus'
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(6): note: see declaration of 'ELauncherTaskStatus'
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\../GenericTask.h(71): error C2065: 'Canceling': undeclared identifier
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\../GenericTask.h(104): error C2039: 'Canceling': is not a member of 'ELauncherTaskStatus'
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(6): note: see declaration of 'ELauncherTaskStatus'
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\../GenericTask.h(104): error C2065: 'Canceling': undeclared identifier
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(700): error C2259: 'SCookAndDeploy::StartCook::FGetNewBuildInfoTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(700): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(700): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(741): error C2259: 'FRefresCPPBinariesTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(741): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(741): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(746): error C2259: 'FRefreshBPBinariesTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(746): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(746): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(779): error C2259: 'FRefresCPPBinariesTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(779): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(779): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(784): error C2259: 'FRefreshBPBinariesTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(784): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(784): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(807): error C2259: 'FCopyDirTreeTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(807): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(807): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(861): error C2259: 'FRefresCPPBinariesTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(861): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(861): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(866): error C2259: 'FRefreshBPBinariesTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(866): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(866): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(898): error C2259: 'FRefresCPPBinariesTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(898): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(898): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(903): error C2259: 'FRefreshBPBinariesTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(903): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(903): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(917): error C2259: 'FCopyDirTreeTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(917): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookAndDeploy.cpp(917): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\STaskListRow.h(135): error C2039: 'Canceling': is not a member of 'ELauncherTaskStatus'
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(6): note: see declaration of 'ELauncherTaskStatus'
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\STaskListRow.h(135): error C2065: 'Canceling': undeclared identifier
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\STaskListRow.h(135): error C2131: expression did not evaluate to a constant
1>  d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\STaskListRow.h(135): note: failure was caused by non-constant arguments or reference to a non-constant symbol
1>  d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\STaskListRow.h(135): note: see usage of 'Canceling'
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\STaskListRow.h(135): error C2051: case expression not constant
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\STaskListRow.h(164): error C2039: 'Canceling': is not a member of 'ELauncherTaskStatus'
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(6): note: see declaration of 'ELauncherTaskStatus'
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\STaskListRow.h(164): error C2065: 'Canceling': undeclared identifier
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\../GenericProcessTask.h(71): error C2039: 'Canceling': is not a member of 'ELauncherTaskStatus'
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(6): note: see declaration of 'ELauncherTaskStatus'
1>d:\_unreal engine 4\source\4.10\engine\source\programs\lazyploylauncher\private\widgets\../GenericProcessTask.h(71): error C2065: 'Canceling': undeclared identifier
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookProgress.cpp(190): error C2039: 'Canceling': is not a member of 'ELauncherTaskStatus'
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(6): note: see declaration of 'ELauncherTaskStatus'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookProgress.cpp(190): error C2065: 'Canceling': undeclared identifier
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookProgress.cpp(321): error C2259: 'FGenericProcessTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookProgress.cpp(321): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookProgress.cpp(321): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookProgress.cpp(330): error C2259: 'FGenericHttpUploadTask': cannot instantiate abstract class
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookProgress.cpp(330): note: due to following members:
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Programs\LazyployLauncher\Private\Widgets\SCookProgress.cpp(330): note: 'bool ILauncherTask::IsCancelling(void) const': is abstract
1>  D:\_Unreal Engine 4\Source\4.10\Engine\Source\Developer\LauncherServices\Public\Interfaces\ILauncherTask.h(89): note: see declaration of 'ILauncherTask::IsCancelling'
1>  -------- End Detailed Actions Stats -----------------------------------------------------------

What am I doing wrong?