Error when opening Architect

bugs
1

After opening Architect version 2026.4.0.4226 the following error message appears:

Error
One or more errors occurred.
------------------------------------------
Could not load file or assembly 'System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
------------------------------------------
========================================
 Stack trace
========================================
   at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)
   at System.Reflection.RuntimeAssembly.GetExportedTypes()
   at Origam.Extensions.TypeExtensions.GetExportedTypes(Assembly assembly)
   at System.Linq.Enumerable.<SelectManyIterator>d__17`2.MoveNext()
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at System.Linq.Enumerable.<SelectManyIterator>d__17`2.MoveNext()
   at System.Linq.Enumerable.<DistinctIterator>d__64`1.MoveNext()
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at System.Linq.Enumerable.<OfTypeIterator>d__95`1.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Origam.Rule.ModelRules.GetErrors(List`1 schemaProviders, FilePersistenceService independentPersistenceService, CancellationToken cancellationToken)
   at OrigamArchitect.frmMain.DoModelChecks(FilePersistenceService independentPersistenceService, CancellationToken cancellationToken)
   at OrigamArchitect.frmMain.<>c__DisplayClass151_0.<RunBackgroundInitializationTasks>b__0()
   at System.Threading.Tasks.Task.Execute()   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at OrigamArchitect.frmMain.TaskErrorHandler(Task previousTask)
2
3

The issue is still there in build 2026.4.0.4228.

Error
One or more errors occurred.
========================================
One or more errors occurred.
------------------------------------------
Could not load file or assembly 'System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
------------------------------------------
========================================
 Stack trace
========================================
   at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)
   at System.Reflection.RuntimeAssembly.GetExportedTypes()
   at Origam.Extensions.TypeExtensions.GetExportedTypes(Assembly assembly)
   at System.Linq.Enumerable.<SelectManyIterator>d__17`2.MoveNext()
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at System.Linq.Enumerable.<SelectManyIterator>d__17`2.MoveNext()
   at System.Linq.Enumerable.<DistinctIterator>d__64`1.MoveNext()
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at System.Linq.Enumerable.<OfTypeIterator>d__95`1.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Origam.Rule.ModelRules.GetErrors(List`1 schemaProviders, FilePersistenceService independentPersistenceService, CancellationToken cancellationToken)
   at OrigamArchitect.frmMain.DoModelChecks(FilePersistenceService independentPersistenceService, CancellationToken cancellationToken)
   at OrigamArchitect.frmMain.<>c__DisplayClass151_0.<RunBackgroundInitializationTasks>b__0()
   at System.Threading.Tasks.Task.Execute()   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at OrigamArchitect.frmMain.TaskErrorHandler(Task previousTask)
4

I’m not able to reproduce the error. The architect properly runs after the installation.

Please try to uninstall it, make sure the folder is empty and install it again.

5

I did exactly that, but it is still there. But it only appears when you open a package (which I do automatically, so I didn’t notice this is the trigger) and then again when you close the Architect.

6

The issue only appears when the data service is set to Origam.DA.Service.PgSqlDataService, Origam.DA.Service, for MsSqlDataService it works fine.

7

2026.4.0.4234 build contains the fix of the issue.

8

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