Hi, thanks for reaching out. We've had a NB server restart and related issues earlier today. Can you please try restarting your NB server completely, and try again? (File / Hub Control Panel / Stop my server / My Server / Launch).
If after that you still see these errors, please post here a code snippet (i.e. which NB, which command, and which error message you get), or even email to us a minimal NB that shows the problem. Please email it to firstname.lastname@example.org
Robert, for the DL team