Mendix.Modeler.Storage.Caches.TypeCacheUnknownTypeException: The type cache does not contain a type with qualified name Microflows$AppServiceCallAction.
at Mendix.Modeler.Storage.Caches.TypeCache.GetCachedType(String qualifiedName) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Caches\TypeCache.cs:line 158
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.ConstructObjectInternal(IStorageUnit containingUnit, IStorageObject container, JObject jObject) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 55
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.ConvertFromStorage(IStorageUnit containingUnit, IStorageObject obj, ICachedProperty prop, JToken token) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 177
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.FillProperties(IStorageUnit containingUnit, IStorageObject obj, JObject jObject, ICachedType cachedType) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 102
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.ConstructObjectInternal(IStorageUnit containingUnit, IStorageObject container, JObject jObject) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 66
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.ConvertFromStorage(IStorageUnit containingUnit, IStorageObject obj, ICachedProperty prop, JToken token) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 177
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.FillProperties(IStorageUnit containingUnit, IStorageObject obj, JObject jObject, ICachedType cachedType) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 97
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.ConstructObjectInternal(IStorageUnit containingUnit, IStorageObject container, JObject jObject) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 66
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.ConvertFromStorage(IStorageUnit containingUnit, IStorageObject obj, ICachedProperty prop, JToken token) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 177
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.FillProperties(IStorageUnit containingUnit, IStorageObject obj, JObject jObject, ICachedType cachedType) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 102
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.ConstructObjectInternal(IStorageUnit containingUnit, IStorageObject container, JObject jObject) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 66
at Mendix.Modeler.Storage.Operations.UnitContentsLoader.ConstructUnitFromContents(IStorageUnit container, Byte[] contents) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitContentsLoader.cs:line 39
at Mendix.Modeler.Storage.Operations.UnitLoader.ConstructUnit(IStorageUnit container, DbDataReader reader) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitLoader.cs:line 233
at Mendix.Modeler.Storage.Operations.UnitLoader.LoadUnits(IStorageUnit unit, IList`1 unitIDs) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitLoader.cs:line 189
at Mendix.Modeler.Storage.Operations.UnitLoader.LoadChildUnits(IStorageUnit unit) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitLoader.cs:line 131
at Mendix.Modeler.Storage.Operations.UnitLoader.LoadChildUnits(IStorageUnit unit) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitLoader.cs:line 158
at Mendix.Modeler.Storage.Operations.UnitLoader.LoadChildUnits(IStorageUnit unit) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitLoader.cs:line 158
at Mendix.Modeler.Storage.Operations.UnitLoader.LoadChildUnits(IStorageUnit unit) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitLoader.cs:line 158
at Mendix.Modeler.Storage.Operations.UnitLoader.Load[T](IProgressInfo info, Dictionary`2 _knownUnits) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Operations\UnitLoader.cs:line 48
at Mendix.Modeler.Operations.ProjectFileLoader.<>c__DisplayClass0_0.<Load>b__0(Database database) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Operations\ProjectFileLoader.cs:line 23
at Mendix.Modeler.Utility.DbConnectors.DbConnector.WithoutTransactionDo[TResult](Func`1 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\DbConnectors\DbConnector.cs:line 65
at Mendix.Modeler.Utility.DbConnectors.SQLiteConnector.Do[TResult](String filePath, Boolean useTransaction, Func`2 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\DbConnectors\SQLiteConnector.cs:line 0
at Mendix.Modeler.Storage.Database.Do[TResult](String filePath, Boolean useTransaction, Func`2 action) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Storage\Database.cs:line 0
at Mendix.Modeler.Operations.ProjectFileLoader.Load(IProgressInfo info, String filePath, Boolean debugLogEnabled) in C:\Users\Autobuild\workspace\AppStudio4.0-Build\modeler\Mendix.Modeler.Core\Operations\ProjectFileLoader.cs:line 19
This error happens when in one of your microflows, you have an app service call action. Could you try deleting all app service call actions from your app and then opening it in Mendix 9?
I came across a similar problem like yours @Andrej
In my project directory / java souce I found that the Consumed App service was still present. Delete those too
Make sure that any usage of (excluded) Consumed or Published app services are not being used.
This solved the issue for me