Professional OPC
Development Tools

logos

lupa

Online Forums

Technical support is provided through Support Forums below. Anybody can view them; you need to Register/Login to our site (see links in upper right corner) in order to Post questions. You do not have to be a licensed user of our product.

Please read Rules for forum posts before reporting your issue or asking a question. OPC Labs team is actively monitoring the forums, and replies as soon as possible. Various technical information can also be found in our Knowledge Base. For your convenience, we have also assembled a Frequently Asked Questions page.

Do not use the Contact page for technical issues.

  1. Forum
  3. Discussions
  5. QuickOPC-UA in .NET
  7. General Issues, Building
  9. NullReferenceException on ReadValue after update 5.80.324

NullReferenceException on ReadValue after update 5.80.324

More
25 Aug 2024 12:04 #13055 by support
Replied by support on topic NullReferenceException on ReadValue after update 5.80.324
Hello,
yes, this is precisely what I needed.

The error turns out to be a consequence of a change in the underlying UA-.NETStandard library (5.80.324 references a new version of it, for security reasons).
Thank you very much for reporting it!

It is now fixed. Please rebuild with QuickOPC 5.80.347 or later: It is now on our Web site, and www.nuget.org.

Best regards

Please Log in or Create an account to join the conversation.

More
23 Aug 2024 13:59 #13046 by Twoaster
Replied by Twoaster on topic NullReferenceException on ReadValue after update 5.80.324
Hi!
Sorry for that, I had to change my catch to (Exception ex) to be able to see the stackTrace.

Please let me know if this is the one you are looking for.
ex.InnerException.StackTrace
 
      at OpcLabs.EasyOpc.UA.Sdk.Extensions.BinaryDecoderExtension.SetStream(BinaryDecoder binaryDecoder, Stream stream)
   at OpcLabs.EasyOpc.UA.Sdk.Extensions.BinaryDecoderExtension.Detach(BinaryDecoder binaryDecoder)
   at OpcLabs.EasyOpc.UA.DataTypeModel.Implementation.UAOpcBinaryDataTypeDefinitionDecoder.Decode(UADataTypeInfo dataTypeInfo, String[] namespaceTable)
   at OpcLabs.EasyOpc.UA.DataTypeModel.Implementation.UAOpcBinaryDts.UncheckedDecodeFromStreamInDataTypeDefinitionModel(UADataTypeInfo dataTypeInfo, Stream stream, UAEndpointDescriptor endpointDescriptor, IUAServerTables serverTables, Boolean fixedLayout)
   at OpcLabs.EasyOpc.UA.DataTypeModel.Implementation.UAOpcBinaryDts.DecodeFromStreamInDataTypeDefinitionModel(UADataTypeInfo dataTypeInfo, Stream stream, UAEndpointDescriptor endpointDescriptor, IUAServerTables serverTables, Boolean fixedLayout)
   at OpcLabs.EasyOpc.UA.DataTypeModel.Implementation.UAOpcBinaryDts.DecodeInDataTypeDefinitionModel(UADataTypeInfo dataTypeInfo, Object objectBody, UAEndpointDescriptor endpointDescriptor, IUAServerTables serverTables, Boolean fixedLayout)
   at OpcLabs.EasyOpc.UA.ComplexData.Implementation.UAComplexDataConverter.<>c__DisplayClass5_0.<ConvertExtensionObjectsToGenericDataInDataTypeDefinitionModel>b__0(Int32 i)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`2.<ForWorker>b__1(RangeWorker& currentWorker, Int64 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`2.<ForWorker>b__1(RangeWorker& currentWorker, Int64 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
   at System.Threading.Tasks.TaskReplicator.Replica.Execute()
The following user(s) said Thank You: support

Please Log in or Create an account to join the conversation.

More
23 Aug 2024 06:11 #13043 by support
Replied by support on topic NullReferenceException on ReadValue after update 5.80.324
Hello,
thank you, I appreciate your effort. However, this appears to be the call stack of the outer AggregateException. Please obtain the call stack of the inner NullReferenceException.

Best regards

Please Log in or Create an account to join the conversation.

More
22 Aug 2024 18:04 #13042 by Twoaster
Replied by Twoaster on topic NullReferenceException on ReadValue after update 5.80.324
Hi, the line throwing the exception is the follow:

genericObject = (UAGenericObject)_easyUAClient.ReadValue(endpointDescriptor, nodeDescriptor);

The details are bellow:
System.AggregateException
  HResult=0x80131500
  Message=One or more errors occurred. (Object reference not set to an instance of an object.)
  Source=System.Threading.Tasks.Parallel
  StackTrace:
   at System.Threading.Tasks.TaskReplicator.Run[TState](ReplicatableUserAction`1 action, ParallelOptions options, Boolean stopOnFirstFailure)
   at System.Threading.Tasks.Parallel.ForWorker[TLocal,TInt](TInt fromInclusive, TInt toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Parallel.ForWorker[TLocal,TInt](TInt fromInclusive, TInt toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
   at System.Threading.Tasks.Parallel.For(Int32 fromInclusive, Int32 toExclusive, Action`1 body)
   at OpcLabs.EasyOpc.UA.ComplexData.Implementation.UAComplexDataConverter.ConvertExtensionObjectsToGenericDataInDataTypeDefinitionModel(IReadOnlyList`1 argumentsList)
   at OpcLabs.EasyOpc.UA.ComplexData.Implementation.UAComplexDataConverter.<>c__DisplayClass4_0.<ConvertExtensionObjectsToGenericData>b__8(IReadOnlyList`1 list2)
   at OpcLabs.BaseLib.Collections.Generic.Extensions.IReadOnlyListExtension.IfThenElse[TInput,TOutput](IReadOnlyList`1 readOnlyList, Predicate`1 condition, Func`2 thenListSelector, Func`2 elseListSelector)
   at OpcLabs.EasyOpc.UA.ComplexData.Implementation.UAComplexDataConverter.<>c__DisplayClass4_0.<ConvertExtensionObjectsToGenericData>b__4(IReadOnlyList`1 list)
   at OpcLabs.BaseLib.Collections.Generic.Extensions.IReadOnlyListExtension.IfThenElse[TInput,TOutput](IReadOnlyList`1 readOnlyList, Predicate`1 condition, Func`2 thenListSelector, Func`2 elseListSelector)
   at OpcLabs.EasyOpc.UA.ComplexData.Implementation.UAComplexDataConverter.ConvertExtensionObjectsToGenericData(IReadOnlyList`1 convertExtensionObjectArgumentsList, UAComplexDataParameters complexDataParameters)
   at OpcLabs.EasyOpc.UA.ComplexData.Implementation.UAComplexDataConverter.<>c__DisplayClass2_0.<ConvertExtensionObjectsToGenericObjects>b__6(IReadOnlyList`1 list)
   at OpcLabs.BaseLib.Collections.Generic.Extensions.IReadOnlyListExtension.IfThenElse[TInput,TOutput](IReadOnlyList`1 readOnlyList, Predicate`1 condition, Func`2 thenListSelector, Func`2 elseListSelector)
   at OpcLabs.EasyOpc.UA.ComplexData.Implementation.UAComplexDataConverter.ConvertExtensionObjectsToGenericObjects(IReadOnlyList`1 convertExtensionObjectInfoList, UAComplexDataParameters complexDataParameters)
   at OpcLabs.EasyOpc.UA.Plugins.ComplexData.Implementation.ComplexDataEasyUAClient.ConvertExtensionObjectsToGenericObjects(IReadOnlyList`1 convertExtensionObjectInfoList)
   at OpcLabs.EasyOpc.UA.Plugins.ComplexData.Implementation.ComplexDataEasyUAClient.<ConvertValueElements>b__6_3(IReadOnlyList`1 list)
   at OpcLabs.BaseLib.Collections.Generic.Extensions.IReadOnlyListExtension.IfThenElse[TInput,TOutput](IReadOnlyList`1 readOnlyList, Predicate`1 condition, Func`2 thenListSelector, Func`2 elseListSelector)
   at OpcLabs.EasyOpc.UA.Plugins.ComplexData.Implementation.ComplexDataEasyUAClient.ConvertValueElements(IReadOnlyList`1 convertValueArgumentsList)
   at OpcLabs.EasyOpc.UA.UAUtilities.ConvertValuesUsing(IReadOnlyList`1 convertValueArgumentsList, Func`2 convertElementsFunction, Func`3 arrayNeedsElementConversionFunction, Func`3 newArrayElementTypeFunction, Boolean convertingBack)
   at OpcLabs.EasyOpc.UA.Implementation.DataConvertingEasyUAClient.ConvertValuesUsing(IReadOnlyList`1 convertValueArgumentsList, Func`2 convertElementsFunction, Boolean convertingBack)
   at OpcLabs.EasyOpc.UA.Implementation.DataConvertingEasyUAClient.ConvertValues(IReadOnlyList`1 convertValueArgumentsList)
   at OpcLabs.EasyOpc.UA.Implementation.DataConvertingEasyUAClient.<>c__DisplayClass1_0.<ConvertAttributeDataUsing>b__4(IReadOnlyList`1 list)
   at OpcLabs.BaseLib.Collections.Generic.Extensions.IReadOnlyListExtension.IfThenElse[TInput,TOutput](IReadOnlyList`1 readOnlyList, Predicate`1 condition, Func`2 thenListSelector, Func`2 elseListSelector)
   at OpcLabs.EasyOpc.UA.Implementation.DataConvertingEasyUAClient.ConvertAttributeDataUsing(IReadOnlyList`1 convertInfoList, Func`2 convertValuesFunction)
   at OpcLabs.EasyOpc.UA.Implementation.DataConvertingEasyUAClient.ConvertAttributeData(IReadOnlyList`1 convertInfoList)
   at OpcLabs.EasyOpc.UA.Implementation.DataConvertingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.Implementation.ForwardingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.Optimization.Implementation.RequestMergingEasyUAClient.<ReadMultiple>b__2_0(UAReadArguments[] array)
   at OpcLabs.BaseLib.OperationModel.Extensions.IReadOnlyListOfOperationArgumentsExtension.MergingPerform[TArguments,TResult](IReadOnlyList`1 argumentsList, Func`2 arrayOperationFunction)
   at OpcLabs.EasyOpc.UA.Optimization.Implementation.RequestMergingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.Implementation.ForwardingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.Implementation.DelegatingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.Implementation.LicensingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.Implementation.MultiplexingEasyUAClient.<>c.<ReadMultiple>b__18_0(IEasyUAClient client, IReadOnlyList`1 list)
   at OpcLabs.BaseLib.Collections.Generic.Extensions.IReadOnlyListExtension.SwitchCase[TInput,TOutput,TKey](IReadOnlyList`1 readOnlyList, Func`2 keySelector, IEqualityComparer`1 keyComparer, Func`3 outputSelector)
   at OpcLabs.EasyOpc.UA.Implementation.MultiplexingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.Implementation.ForwardingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.Implementation.ForwardingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.Implementation.DelegatingEasyUAClient.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.EasyUAClientCore.ReadMultiple(UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.IEasyUAClientExtension.ReadMultipleValues(IEasyUAClient client, UAReadArguments[] readArgumentsArray)
   at OpcLabs.EasyOpc.UA.IEasyUAClientExtension.ReadValue(IEasyUAClient client, UAReadArguments readArguments)
   at OpcLabs.EasyOpc.UA.IEasyUAClientExtension.ReadValue(IEasyUAClient client, UAEndpointDescriptor endpointDescriptor, UANodeDescriptor nodeDescriptor)
   at Test.CleanArch.Infrastructure.PLC.OpcCommunication.WriteClass(String machineIp, String machineType, MachineData opcVariable, String JSONData) in C:\Users\joao\git\VSOS\src\Test.CleanArch.Infrastructure\PLC\OpcCommunication.cs:line 208
   at Test.CleanArch.UseCases.MachineDataRepo.PlcWrite(String machineIp, String machineType, MachineData updatedData, String JsonData) in C:\Users\joao\git\VSOS\src\Test.CleanArch.UseCases\MachineDataRepo.cs:line 167
   at Test.CleanArch.UseCases.VLM.MachineSettings.StartupPlcSettingsUseCase.Execute(String IP) in C:\Users\joao\git\VSOS\src\Test.CleanArch.UseCases\VLM\MachineSettings\StartupPlcSettingsUseCase.cs:line 53
   at Test.CleanArch.Blazor.Components.Layout.AlarmStrip.OnInitialized() in C:\Users\joao\git\VSOS\src\Test.CleanArch.Blazor\Components\Layout\AlarmStrip.razor:line 53
   at Microsoft.AspNetCore.Components.ComponentBase.<RunInitAndSetParametersAsync>d__21.MoveNext()
 
  This exception was originally thrown at this call stack:
    [External Code]
 
Inner Exception 1:
NullReferenceException: Object reference not set to an instance of an object.

Please Log in or Create an account to join the conversation.

More
22 Aug 2024 15:33 #13041 by support
Replied by support on topic NullReferenceException on ReadValue after update 5.80.324
Hello.

It is not clear which line of code you mean, but I suppose it is the one with the ReadValue call, is that correct?

Please provide the stack trace of the (inner) NullReferenceException.

Best regards

Please Log in or Create an account to join the conversation.

More
22 Aug 2024 15:11 #13040 by Twoaster
NullReferenceException on ReadValue after update 5.80.324 was created by Twoaster
Hi!
I have a C# project and my code was working with no errors or issues until I updated it to the latest version 5.80.324.
Previously I was using 5.80.277.

I'm getting this error on the line of the ReadValue call.
System.AggregateException: 'One or more errors occurred. (Object reference not set to an instance of an object.)'
Inner Exception
NullReferenceException: Object reference not set to an instance of an object.
 IEasyUAClient _easyUAClient;
...
//On my constructor (I suppressed part of the code here)
_easyUAClient = new EasyUAClient();
this._easyUAClient = easyUAClient;
...
public Result Write(string Ip, string machineType, MachineData opcVariable, string JSONData)
 {
   UAEndpointDescriptor endpointDescriptor = $"{Suppressed_Descriptor}";
   UANodeDescriptor nodeDescriptor = $"{Suppressed_Descriptor}";
 
   UAGenericObject genericObject = new UAGenericObject();
   try
   {
     genericObject = (UAGenericObject)_easyUAClient.ReadValue(endpointDescriptor, nodeDescriptor);
   }
   catch (UAException ex)
   {
     _logger.LogError("Read OPC Value error {ex}", ex);
     return Result.Error(ex.Message);
   }
}

Did something changed on the new version that I'm not considering on this code?
Thanks!

Please Log in or Create an account to join the conversation.

Moderators: support
  1. Forum
  3. Discussions
  5. QuickOPC-UA in .NET
  7. General Issues, Building
  9. NullReferenceException on ReadValue after update 5.80.324
Time to create page: 0.084 seconds