July 20, 2017
Error Deleting Selection in Enotebook:
Sorry, the Chemistry notebook "name" cannot be deleted because references to Chemistry notebook "name" exist.
This error appear when another user edit the same experiment with a different session, creating a reference to the experiment in the Offline folder of the second user.
To avoid this problem login with an Administrator account, check all Offline folders and delete the references, then delete the main notebook.