In the event that your pipeline can not be found for the selected domain, please go trough and verify all of the following:
- Double check Pipeline-Node naming
Pipeline URLs are generated by their name and your desired entry node, in this scenario, I would expect a file named Hello.xml in you cartridge's pipeline directory, and a start node named Start, would be accessed via {instanceURL}/on/demandware.store/Sites-mySite-Site/Hello-Start
- Try and force upload of your cartridges
Occasionally the files on the server will not be updated correctly when a save is made; to force an update, right click your project, click Demandware > Upload Cartridges
- Check your Cartridge Path
If you are using a shared instance, or your instance is re-provisioned, you may need to check your cartridge path to be sure your custom cartridge(s) are still there.
- Check your Code Versions
Occasionally you may increment / change your code version - if you do, make sure that the path you select in Studio is the one that you have selected in Business Manager.
- Tech Support
Should you still have issues following the four steps above, please file a support ticket and the tech-support team will be able to provide you with more assistance.