Apps or Adapters Missing from Application Build
For IAP version 2019.3 and above, the workflow_builder application will encounter an exception when a task is accessed and the underlying app or adapter is missing from the application build. This happens when a workflow is built in an older version of IAP and then imported into the 2019.3 or higher versions.
With this type of exception, the workflow_builder application will hang and none of the tasks will be accessible. To resolve, refresh the webpage to make all the tasks accessible again.
In the image below, notice that the syncFrom task (added into version 2019.3) is retrieved and the underlying application is app-deviceManager (which is not part of the 2019.3 build).
Notice the error in the browser console.
Considering the task will never open, it becomes practically impossible to determine the assigned variables in a task. To get around this you will need to open the workflow document in your MongoDB database.
Note: If you are still experiencing issues with workflows, please log a ticket with the Itential Service Desk. Be sure to provide all necessary information to reproduce the problem.