Hello, I prepared files of R1, R2 and NOE at two different fields on a protein, using Dynamics Center. Upon running the Execute in the GUI, I received the following error message. Could you please explain to me what is wrong and how I can fix it? Best, Stefano "Missing data The set up is incomplete Please check for the following missing information: Interatomic data (for the dipole-dipole interaction) Spin 'name:1@N' - nuclear isotope data (try the spin.isotope user function). ...continuing on for all spins"