I am trying to publish SharePoint 2013 designer workflow to SharePoint online site. This is a existing workflow and couple of changes made and there are no any errors in the workflow. But When I am trying to publish it, it is throwing me the error -
Microsoft.Workflow.Client.ActivityValidationException: Workflow XAML failed validation due to the following errors: Visual Basic expression is disallowed: '[Nothing]'. Visual Basic expression is disallowed: '[Nothing]'. HTTP headers received from the server - ActivityId: ID here. NodeId: . Scope: . Client ActivityId : ID here. ---> System.Net.WebException: The remote server returned an error: (400) Bad Request. at Microsoft.Workflow.
Kindly suggest what needs to be done.