Unable to call Custom workflow from D365 Action

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Posted on by Sri Kanth

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Hi All,

I was suppose to call a custom workflow from a action. My action executed successfully and when it is trying to trigger custom workflow step it is showing below error.

Sync workflow failed with error message - Unhandled Exception: Microsoft.Crm.Workflow.Services.InvalidCustomActivityExecutionException: Unexpected exception from plug-in (Execute): Method: System.NullReferenceException: Object reference not set to an instance of an object.
at System.Activities.WorkflowApplication.Invoke(Activity activity, IDictionary`2 inputs, WorkflowInstanceExtensionManager extensions, TimeSpan timeout)
at System.Activities.WorkflowInvoker.Invoke(Activity workflow, IDictionary`2 inputs, TimeSpan timeout, WorkflowInstanceExtensionManager extensions)
at Microsoft.Crm.Workflow.SynchronousRuntime.SynchronousWorkflowActivityHost.ExecuteWorkflowUsingInvoker(Activity workflow, ICommonWorkflowContext context)
at Microsoft.Crm.Workflow.SynchronousRuntime.SynchronousWorkflowActivityHost.StartWorkflow(WorkflowActivationData activationData, ICommonWorkflowContext context)
, error code - -2147220891

Some how I understodd that my System.Activities.dll is causing the issue.

My .NET framework 4.6.1

Thanks in advance

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Preeti Sharma 2,678 on at

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Hi,

I think error is occurring in your custom workflow somewhere. Check your code for that.

Thanks:)

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Michel Gueli 982 on at

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Do you have a custom workflow assembly in your custom workflow? Try to add some null checks.

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Sri Kanth 100 on at

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HI Michel,

The Execute Method contains no code, I was just throwing an exception to check whether the workflow is triggering or not

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Sri Kanth 100 on at

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Hi Preeti,

The Execute Method contains no code, I was just throwing an exception to check whether the workflow is triggering or not.

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Peter Bohn on at

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Do you found a solution for this?

I have a similar problem.

In wf-excecution i checked all used attributes if they are null, but even if this is not the case, the error comes sometimes.

We use a selfmade custom workflow too.

thx

Greets PeB

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Community Member on at

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Hi Sri,

The error is due to a null reference coming through: Method: System.NullReferenceException: Object reference not set to an instance of an object.

A good way of finding out what values are returning is to use the "Throw New Exception" method. For example: throw new Exception(quoteRef.LogicalName);

That way you will be able to find out if there is a null reference and set a default value for if there is one.

If you are retrieving field values, use the following syntax to set default values for entity references:

EntityReference AccountEntity = this.Account.Get(executionContext);

Entity AccountRef = service.Retrieve(AccountEntity.LogicalName, AccountEntity.Id, new ColumnSet("parentaccountid"));

EntityReference ParentAccountRef = AccountRef.Attributes.Contains("parentaccountid") ? (EntityReference)AccountRef["parentaccountid"] : null;

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