Asset Editor Error: Unable to view or add assets

[Lonecat Nekophrodite]

Not this again! Didn't faulty SDK Tools knows to stop goin' nuts?

Here I'm trying to add new assets (units). hitting 'add new' button however, brought up error

and here's message.

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.NotSupportedException: The given path's format is not supported.
   at System.Security.Permissions.FileIOPermission.EmulateFileIOPermissionChecks(String fullPath)
   at System.Security.Permissions.FileIOPermission.QuickDemand(FileIOPermissionAccess access, String fullPath, Boolean checkForDuplicates, Boolean needFullPath)
   at System.IO.File.InternalGetLastWriteTimeUtc(String path, Boolean checkHost)
   at System.IO.File.GetLastWriteTime(String path)
   at Firaxis.AssetBrowser.ViewModels.InstanceEntityViewModel..ctor(ICivTechService civTechSvc, String name, InstanceType type, Func`3 loadFunction)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   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, StackCrawlMark& stackMark)
   at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at System.Activator.CreateInstance(Type type, Object[] args)
   at Firaxis.AssetBrowser.ViewModels.InstanceEntityViewModel.Create(InstanceType type, ICivTechService civTechService, String name, Func`3 loadFunction)
   at Firaxis.AssetBrowser.ViewModels.AssetBrowserViewModel.BuildFilteredEntityCollection(IList`1 inputEntities)
   at Firaxis.AssetBrowser.ViewModels.AssetBrowserViewModel.LoadPageWork(Object args)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()

Did Firaxis tried to stop my modding process NOW? or is there any fix to resume operation? This error shows up today.
Viewing asset is not even possible now