Add this to the list of Appsheet issues our organization has begun to experience over the past couple of months. I'm seeing this error more and more frequently, and I do not know what it means. It almost reads like there's a coding problem with Appsheet itself on the server:
Operation: App sync
Message: Object reference not set to an instance of an object. System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.) ---> System.NullReferenceException: Object reference not set to an instance of an object. at System.Collections.Generic.HashSet`1.FindItemIndex(T item) at RequestContextFramework.TableDataCacheEntry.ContainsAllColumnPositions(ReadOnlySpan`1 columnPositions) in C:\tmpfs\appsheet\RequestContext\RequestContextFramework\TableDataCacheEntry.cs:line 22 at AppContext.AppDataContext.AddColumnsIfNecessary(TableDataCacheEntry tableDataCacheEntry, String tableName, ItemSchema thisSchema, ReadOnlySpan`1 columnPositions, Boolean& addedColumns) in C:\tmpfs\appsheet\Data\AppContext\AppDataContext.cs:line 670 at AppContext.AppDataContext.GetRootTableDataFromCache(String tableName, ReadOnlySpan`1 columnPositions, Boolean& addedColumns) in C:\tmpfs\appsheet\Data\AppContext\AppDataContext.cs:line 720 at AppContext.AppDataContext.GetTableIndexFromCache(String tableName, ItemSchema tableSchema, ReadOnlySpan`1 keyColumnPositions, ReadOnlySpan`1 requiredVirtualColumns) in C:\tmpfs\appsheet\Data\AppContext\AppDataContext.cs:line 952 at AppContext.AppDataContext.ColumnValues(Int32 depth, String tableName, Nullable`1 rowListAttrIndex, Int32 columnPosition, AppEvaluatable rowFilter, Nullable`1 maxResults, Int32 rowListContextLevel) in C:\tmpfs\appsheet\Data\AppContext\AppDataContext.cs:line 224 at Jeenee.DataTypes.ColumnSetExpression.Evaluatable.RunAndFilter(Int32 depth, ListMetaData listTypeQualifier, IDataContext dataContext, String tableName, Nullable`1 rowListAttrIndex, Int32 colIndex, AppEvaluatable columnFilter, Boolean makeDistinct, Int32 rowListContextLevel, Nullable`1 maxResults) at Jeenee.DataTypes.SelectFunction.Run(Int32 depth, Evaluatable funcExpressionEvaluatable, IDataContext dataContext, ImmutableArray`1 children, List`1 argumentValues) in C:\tmpfs\appsheet\DataTypes\Expressions\Functions\OtherFunctions.cs:line 861 at Jeenee.DataTypes.BuiltinFunction.RunBatch(Int32 depth, Evaluatable funcExpressionEvaluatable, BatchDataContext batchDataContext, ImmutableArray`1 children, BatchArguments batchArguments) in C:\tmpfs\appsheet\DataTypes\Expressions\Functions\FunctionRegistry.cs:line 79 at Jeenee.DataTypes.BuiltinFunctionExpression.Evaluatable.RunBatch(Int32 depth, BatchDataContext batchDataContext, BatchArguments batchArguments) in C:\tmpfs\appsheet\DataTypes\Expressions\FunctionExpression.cs:line 158 at Jeenee.DataTypes.AppEvaluatable.RunBatch(Int32 depth, BatchDataContext batchDataContext, BatchTrace batchTrace) in C:\tmpfs\appsheet\DataTypes\Expressions\AppEvaluatable.cs:line 373 at LegacyDataLayer.LegacyVirtualColumnsDataLayer.GetComputedFieldValuesBatch(Context context, IDataContext dataContext, TableData tableData, SchemaField attr, Int32 col) in C:\tmpfs\appsheet\Data\LegacyDataLayer\LegacyVirtualColumnsDataLayer.cs:line 365 at LegacyDataLayer.LegacyVirtualColumnsDataLayer.GetComputedFieldValues(Context context, IDataContext dataContext, TableData tableData, ItemSchema tableSchema, SchemaField attr) in C:\tmpfs\appsheet\Data\LegacyDataLayer\LegacyVirtualColumnsDataLayer.cs:line 324 at LegacyDataLayer.LegacyVirtualColumnsDataLayer.AugmentData(Context context, AppTemplate appTemplate, String tableName, TableData tableData, ItemSchema itemSchema, Boolean keysOnly, AppErrors appErrors) in C:\tmpfs\appsheet\Data\LegacyDataLayer\LegacyVirtualColumnsDataLayer.cs:line 902 at LegacyDataLayer.LegacyDataAccessDataLayer.GetTableData(Context context, AppTemplate appTemplate, String tableDataIdentifier, Int32 userId, AppTable appTable, ItemSchema tableSchema, UseCacheOption useCache, Boolean augmentData, AppEvaluatable filter, Nullable`1 ifModifiedSinceDate, Boolean& notModified, AppErrors appErrors, Boolean ignoreSecurityFilters) in C:\tmpfs\appsheet\Data\LegacyDataLayer\LegacyDataAccessDataLayer.cs:line 3006 at LegacyDataLayer.LegacyAppTemplateDataLayer.GetTableData(Context context, AppTemplate appTemplate, AppTable appTable, Int32 userId, Boolean augmentData, AppEvaluatable filter, Nullable`1 ifModifiedSince, Boolean& notModified, AppErrors appErrors) in C:\tmpfs\appsheet\Data\LegacyDataLayer\LegacyAppTemplateDataLayer.cs:line 386 at AppApiHandler.SyncRequestHandler.ParallelReadTable(Context perTableContext, Int32 thisUserId, String appTemplateName, AppTemplate appTemplate, AppTable appTable, String tableTimestampsFromClient, TableParams tableParamsFromClient, AppErrors perTableAppErrors, DataFormat desiredFormat, ConcurrentDictionary`2 tableDataSideChannel) in C:\tmpfs\appsheet\ControllerHandler\AppApiHandler\SyncRequestHandler.cs:line 894 at AppApiHandler.SyncRequestHandler.<>c__DisplayClass22_0.<ParallelReadTables>b__1(AppTable appTable) in C:\tmpfs\appsheet\ControllerHandler\AppApiHandler\SyncRequestHandler.cs:line 658 at System.Threading.Tasks.Parallel.<>c__DisplayClass44_0`2.<PartitionerForEachWorker>b__1(IEnumerator& partitionState, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion) --- End of stack trace from previous location --- at System.Threading.Tasks.Parallel.<>c__DisplayClass44_0`2.<PartitionerForEachWorker>b__1(IEnumerator& partitionState, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion) at System.Threading.Tasks.TaskReplicator.Replica.Execute() --- End of inner exception stack trace --- at System.Threading.Tasks.TaskReplicator.Run[TState](ReplicatableUserAction`1 action, ParallelOptions options, Boolean stopOnFirstFailure) at System.Threading.Tasks.Parallel.PartitionerForEachWorker[TSource,TLocal](Partitioner`1 source, ParallelOptions parallelOptions, Action`1 simpleBody, Action`2 bodyWithState, Action`3 bodyWithStateAndIndex, Func`4 bodyWithStateAndLocal, Func`5 bodyWithEverything, Func`1 localInit, Action`1 localFinally) --- End of stack trace from previous location --- at System.Threading.Tasks.Parallel.ThrowSingleCancellationExceptionOrOtherException(ICollection exceptions, CancellationToken cancelToken, Exception otherException) at System.Threading.Tasks.Parallel.PartitionerForEachWorker[TSource,TLocal](Partitioner`1 source, ParallelOptions parallelOptions, Action`1 simpleBody, Action`2 bodyWithState, Action`3 bodyWithStateAndIndex, Func`4 bodyWithStateAndLocal, Func`5 bodyWithEverything, Func`1 localInit, Action`1 localFinally) at AppApiHandler.SyncRequestHandler.ParallelReadTables(IPerfCollector perfCollector, Context context, String appTemplateName, AppTemplate appTemplate, AppTemplate smallClone, String tableTimestampsFromClient, Dictionary`2 perTableParamsFromclient, DataFormat desiredFormat, Boolean warnClientUpdate) in C:\tmpfs\appsheet\ControllerHandler\AppApiHandler\SyncRequestHandler.cs:line 789 at AppApiHandler.SyncRequestHandler.ExecuteSyncRequest(IPerfCollector perfCollector, Context context, AppSyncRequest request, Boolean userIsAuthenticated, Boolean cookiesHasStartWithToken, String requestUrl, Uri referrer, String returnUrlParameter, String webViewParameter, String androidParameter, String isCompliantParameter, StartAppToken startAppToken, String appver) in C:\tmpfs\appsheet\ControllerHandler\AppApiHandler\SyncRequestHandler.cs:line 514
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