Why do I receive flowchart does not have a startnode error?

I have created a flowchart to extract text from a PDF. For some reason I get an error saying

flowchart does not have a start node

A start node is mandatory in a flowchart. I suspect your first block/activity in your flowchart is NOT set as start node. To set it as start node : Right click on the first activity of your flowchart and select “Set as start node”.
If this doesn’t resolve your issue, please share your workflow, will help you out.