When importing a workflow into Nintex workflow designer, the workflow cannot be imported and the below message will appear in the browser : Page can’t be displayed
Nintex.Workflow.NWRenderWorkflowException: Error rendering workflow. ---> Nintex.Workflow.NWActivityAdapterInvokeException: Error rendering activity of type Nintex.Workflow.Activities.Adapters.NWSendMessageAdapter
Review the Workflow design for any actions send an email, such as Send a Notification or a Task action. If the email recipients are hard-coded with the domain\username, then remove the email recipients with hard-coded domain\username, replace it with variable and insert the hard-coded domain\username into the variable.
The issue occurs due to timeout when trying to resolve the email recipients that hard-coded on the exported workflow. The resolving name process does occur if the hard-coded email assigned to a variable.