Hi MorganRock,
Error code 59 corresponds to a network being unreachable. Is the cRIO properly connected to the network?
If it is, another thing to check is the DNS server address. In NI-MAX, navigate to Remote Systems -> [your cRIO] -> Network Settings. If you're using static addressing, make sure the DNS server is correctly set. If it's not, set it. If it is not correctly set, LabVIEW will not be able to correctly navigate to the address you've specified (...herokuapp.com/api/datasets...).
If neither of these troubleshooting steps work, please reply with more information about your application. Where is the data hosted? What model cRIO are you using?
Have a nice day,
Andrew
Andrew T.
"His job is to shed light, and not to master" - Robert Hunter