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LT8392 Application circuit/ Timestep too small


I am trying to simulate the Typical Application circuit found on pg 25 of the LT8392 datasheet (exact copy paste except from two of the MOSFETs which could not be found in the libraries)
but I get the following message every time

"Analysis: Time step too small; initial timepoint: trouble with schmitt-instance a:u 1:40"

What does it mean and how can that be fixed please? 

Thanks for your help