Adding a Microflow with Exception

[acarum]

I'm getting this error trying to add a Microflow

2026-03-26 12:05:57.4646 INFO lambda_method18 The project database format is Version2
2026-03-26 12:05:57.6390 INFO Mendix.Modeler.UIFramework.Progress.ProcessRunner An exception occurred during step 'Synchronize with file system'
System.InvalidOperationException: Could not create Add status item for unitID '7046c755-5fb5-4c91-9a95-5ef3fbcfffe2' of type 'Microflows$Microflow'.
at Mendix.Modeler.VersionControl.Status.RevStatusCache.CheckUnitID(DiffItem diff, Dictionary2 unitDict, String mineFilePath) in Mendix.Modeler.Core\VersionControl\Status\RevStatusCache.cs:line 194 at Mendix.Modeler.VersionControl.Status.RevStatusCache.CreateStatusItem(DiffItem diff, Dictionary2 unitDict, String baseFilePath, String mineFilePath) in Mendix.Modeler.Core\VersionControl\Status\RevStatusCache.cs:line 173
at Mendix.Modeler.VersionControl.Status.RevStatusCache.AddStatusItems(IEnumerable1 diffs, Dictionary2 unitDict, String baseFilePath) in Mendix.Modeler.Core\VersionControl\Status\RevStatusCache.cs:line 164
at Mendix.Modeler.VersionControl.Status.RevStatusCache.DoRefresh(IProgressInfo info) in Mendix.Modeler.Core\VersionControl\Status\RevStatusCache.cs:line 92
at Mendix.Modeler.VersionControl.Status.StatusCacheManager.RefreshAll(IProgressInfo info) in Mendix.Modeler.VersionControl\Status\StatusCacheManager.cs:line 89
at Mendix.Modeler.VersionControl.Status.StatusCacheManager.ProjectManagerOnProjectFileChanged(Object sender, ProjectFileChangedEventArgs e) in Mendix.Modeler.VersionControl\Status\StatusCacheManager.cs:line 81
at Mendix.Modeler.Core.ProjectManager.RaiseProjectFileChanged(IProgressInfo info) in Mendix.Modeler.Core\Core\ProjectManager.cs:line 214
at Mendix.Modeler.Main.FileSystems.CoreFileSystemPlugin.Synchronize(IProject project, SynchronizeMode mode) in Mendix.Modeler.Core\Main\FileSystems\CoreFileSystemPlugin.cs:line 41
at Mendix.Modeler.Main.FileSystems.FileSystemPluginRegistry.<>c__DisplayClass11_0.b__0(IFileSystemPlugin plugin) in Mendix.Modeler.Core\Main\FileSystems\FileSystemPluginRegistry.cs:line 94
at System.Linq.Enumerable.All[TSource](IEnumerable1 source, Func2 predicate)
at Mendix.Modeler.Main.FileSystems.FileSystemPluginRegistry.Synchronize(IProject project, SynchronizeMode mode) in Mendix.Modeler.Core\Main\FileSystems\FileSystemPluginRegistry.cs:line 89
at Mendix.Modeler.Main.FileSystems.FileSystemPluginRegistry.ExecuteSynchronizeStepAction(Func1 getProject, SynchronizeMode mode, IProgressInfo info) in Mendix.Modeler.Core\Main\FileSystems\FileSystemPluginRegistry.cs:line 131 at Mendix.Modeler.Main.FileSystems.FileSystemPluginRegistry.<>c__DisplayClass10_0.<AddSynchronizeStep>b__0(IProgressInfo info) in Mendix.Modeler.Core\Main\FileSystems\FileSystemPluginRegistry.cs:line 77 at Mendix.Modeler.Utility.Progress.StepBase1.Run(TProgressInfo info) in Mendix.Modeler.Utility\Progress\Step.cs:line 32
at Mendix.Modeler.Utility.Progress.StepBase1.Mendix.Modeler.Utility.Progress.IStep.Run(Object progressInfo) in Mendix.Modeler.Utility\Progress\Step.cs:line 37 at Mendix.Modeler.UIFramework.Progress.ProcessRunner.RunStep(IStep step) in Mendix.Modeler.UIFramework\Progress\ProcessRunner.cs:line 240 at Mendix.Modeler.UIFramework.Progress.ProcessRunner.OnDoWork(Object sender, DoWorkEventArgs e) in Mendix.Modeler.UIFramework\Progress\ProcessRunner.cs:line 157 at Mendix.Modeler.Undo.UndoDelegatingBackgroundWorker.OnDoWork(DoWorkEventArgs e) in Mendix.Modeler.Undo\UndoDelegatingBackgroundWorker.cs:line 22 at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument) 2026-03-26 12:05:57.6801 ERROR Mendix.Modeler.Core.View.ExceptionHandling.ExceptionHandler An unhandled exception occurred. System.InvalidOperationException: Could not create Add status item for unitID '7046c755-5fb5-4c91-9a95-5ef3fbcfffe2' of type 'Microflows$Microflow'. at Mendix.Modeler.VersionControl.Status.RevStatusCache.CheckUnitID(DiffItem diff, Dictionary2 unitDict, String mineFilePath) in Mendix.Modeler.Core\VersionControl\Status\RevStatusCache.cs:line 194
at Mendix.Modeler.VersionControl.Status.RevStatusCache.CreateStatusItem(DiffItem diff, Dictionary2 unitDict, String baseFilePath, String mineFilePath) in Mendix.Modeler.Core\VersionControl\Status\RevStatusCache.cs:line 173 at Mendix.Modeler.VersionControl.Status.RevStatusCache.AddStatusItems(IEnumerable1 diffs, Dictionary2 unitDict, String baseFilePath) in Mendix.Modeler.Core\VersionControl\Status\RevStatusCache.cs:line 164 at Mendix.Modeler.VersionControl.Status.RevStatusCache.DoRefresh(IProgressInfo info) in Mendix.Modeler.Core\VersionControl\Status\RevStatusCache.cs:line 92 at Mendix.Modeler.VersionControl.Status.StatusCacheManager.RefreshAll(IProgressInfo info) in Mendix.Modeler.VersionControl\Status\StatusCacheManager.cs:line 89 at Mendix.Modeler.VersionControl.Status.StatusCacheManager.ProjectManagerOnProjectFileChanged(Object sender, ProjectFileChangedEventArgs e) in Mendix.Modeler.VersionControl\Status\StatusCacheManager.cs:line 81 at Mendix.Modeler.Core.ProjectManager.RaiseProjectFileChanged(IProgressInfo info) in Mendix.Modeler.Core\Core\ProjectManager.cs:line 214 at Mendix.Modeler.Main.FileSystems.CoreFileSystemPlugin.Synchronize(IProject project, SynchronizeMode mode) in Mendix.Modeler.Core\Main\FileSystems\CoreFileSystemPlugin.cs:line 41 at Mendix.Modeler.Main.FileSystems.FileSystemPluginRegistry.<>c__DisplayClass11_0.<Synchronize>b__0(IFileSystemPlugin plugin) in Mendix.Modeler.Core\Main\FileSystems\FileSystemPluginRegistry.cs:line 94 at System.Linq.Enumerable.All[TSource](IEnumerable1 source, Func2 predicate) at Mendix.Modeler.Main.FileSystems.FileSystemPluginRegistry.Synchronize(IProject project, SynchronizeMode mode) in Mendix.Modeler.Core\Main\FileSystems\FileSystemPluginRegistry.cs:line 89 at Mendix.Modeler.Main.FileSystems.FileSystemPluginRegistry.ExecuteSynchronizeStepAction(Func1 getProject, SynchronizeMode mode, IProgressInfo info) in Mendix.Modeler.Core\Main\FileSystems\FileSystemPluginRegistry.cs:line 131
at Mendix.Modeler.Main.FileSystems.FileSystemPluginRegistry.<>c__DisplayClass10_0.b__0(IProgressInfo info) in Mendix.Modeler.Core\Main\FileSystems\FileSystemPluginRegistry.cs:line 77
at Mendix.Modeler.Utility.Progress.StepBase1.Run(TProgressInfo info) in Mendix.Modeler.Utility\Progress\Step.cs:line 32 at Mendix.Modeler.Utility.Progress.StepBase1.Mendix.Modeler.Utility.Progress.IStep.Run(Object progressInfo) in Mendix.Modeler.Utility\Progress\Step.cs:line 37
at Mendix.Modeler.UIFramework.Progress.ProcessRunner.RunStep(IStep step) in Mendix.Modeler.UIFramework\Progress\ProcessRunner.cs:line 240
at Mendix.Modeler.UIFramework.Progress.ProcessRunner.OnDoWork(Object sender, DoWorkEventArgs e) in Mendix.Modeler.UIFramework\Progress\ProcessRunner.cs:line 157
at Mendix.Modeler.Undo.UndoDelegatingBackgroundWorker.OnDoWork(DoWorkEventArgs e) in Mendix.Modeler.Undo\UndoDelegatingBackgroundWorker.cs:line 22
at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
--- End of stack trace from previous location ---
at Mendix.Modeler.UIFramework.Progress.ProcessRunner.Run() in Mendix.Modeler.UIFramework\Progress\ProcessRunner.cs:line 108
at Mendix.Modeler.Main.FileSystems.FileSystemPluginRegistry.LaunchSynchronizeProcess(IProject project) in Mendix.Modeler.Core\Main\FileSystems\FileSystemPluginRegistry.cs:line 56
at Mendix.Modeler.MainWindow.Menus.MenuItemsProviders.ProjectMenuDirectoryMenuItemsProvider.<>c__DisplayClass5_0.<.ctor>b__0() in Mendix.Modeler.MainWindow\Menus\MenuItemsProviders\ProjectMenuDirectoryMenuItemsProvider.cs:line 41
at Eto.Forms.RelayCommand.<>c__DisplayClass0_0.<.ctor>b__0(Object obj)
at Eto.Forms.RelayCommand`1.Execute(Object parameter)
at Eto.PropertyStore.CommandWrapper.Command_Execute(Object sender, EventArgs e)
at Eto.Forms.Command.OnExecuted(EventArgs e)
at Mendix.Modeler.Controls.Menus.AsyncInvokedCommand.<>n__0(EventArgs e)
at Mendix.Modeler.Controls.Menus.AsyncInvokedCommand.<>c__DisplayClass2_0.b__0() in Mendix.Modeler.Controls\Menus\MenuItemViewModel.cs:line 192
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

[ako]

Can you share the mdl source of the microflow? What mendix version are you using?

[acarum]

Mendix Studio Pro 11.8.0

/**

• Data source microflow that returns all UoM records.
• @returns List of UoM entities
  */
  CREATE MICROFLOW MyModule."DS_GetUoM" (
  )
  RETURNS List of OpcenterEXFN_ReferenceData."UoM" AS $UoMList
  BEGIN
  RETRIEVE $UoMList FROM OpcenterEXFN_ReferenceData."UoM";
  RETURN $UoMList;
  END;
  /

[ako]

Thanks for reporting this. We investigated the error and the root cause is modifying the project while Studio Pro has it open.

What's happening

The stack trace shows Studio Pro's version control subsystem (RevStatusCache.CheckUnitID) trying to reconcile file system changes that were made outside of Studio Pro. When mxcli adds a new unit (.mxunit file + database row), Studio Pro's internal cache doesn't know about it, and the "Synchronize with file system" step fails trying to create a diff status item for the new unit.

We verified that mxcli's output is correct:

• The UUID in the file path, the UnitID blob in the database, and the $ID in the BSON content all match using the correct Microsoft GUID byte-swap convention
• The ContentsHash is computed correctly
• The file is placed in the correct mprcontents/XX/YY/ directory structure

Workaround

Close the project in Studio Pro before running mxcli, then re-open it. Studio Pro will load the modified project cleanly from disk without needing to reconcile in-flight changes.

1. Close project in Studio Pro (or close Studio Pro entirely)
2. Run mxcli to make changes
3. Re-open the project in Studio Pro

This is a fundamental limitation — Studio Pro doesn't support external tools modifying the project while it's open, since it maintains in-memory caches and version control state that can't be updated externally.

[acarum]

I got it, but how can I check if the changes were triggered correctly?

[ako]

Reload the application in studio pro.