i think the issue is with Properties of Add Data Row activity:
- ArrayRow Input Property needs to be an Object, so you need to pass the values via a variable.
- DataTable Input needs to contain a Table that has been initialized already, if the Table does not exist UiPath will generate an error
Please check the solution below as per your values:
Variables are the following:
Initialize your DataTable variable if you have not done it before in your Workflow:
And then populate your Add Data Row activity as follow:
If you run this Workflow in Output pane you will see the value of first row in DataTable that will be 1,2,3.