Hi Everyone
We have created a Business event to create a task using the Action Execution option in the Business event.
When ever the Owner changes in Opportunties the Business event should create a task.
We are getting the error ‘Error: The argument cannot be null.Parameter name: key
![](https://uploads-us-west-2.insided.com/acumatica-en/attachment/0c568f37-db8f-40da-9f9a-82b7d5af3dc6.png)
![](https://uploads-us-west-2.insided.com/acumatica-en/attachment/1d325a01-cc50-4cc5-bb9e-a60e00a53d8a.png)
![](https://uploads-us-west-2.insided.com/acumatica-en/attachment/53248ae8-e656-4cdb-b93f-cd70f8089b86.png)
![](https://uploads-us-west-2.insided.com/acumatica-en/attachment/bd403312-33a8-4a92-92fd-949b107a85f6.png)