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This message is indicative of some modelling error in your model as Shift is the centre of cyclic frequency range that is used to limit the modal frequency range i.e to enforce program to neglect modes with frequencies below shift,By default shift is a very small value something like .0001,any mode with eigen value lesser than that of shift means a mode with a very low frequency or a very high modal period that indicates some modelling most probably member connectivity error in your model.