few checks to see if the model had all sort of elements in it, view with text file editor and look for all the beam and solids elemnts cards and parts are intact, if not you need to fix it either by recreating or starting from scratch.
if you are refering "LS-DYNA student version 4.7.17 " as LS-PREPOST, use 4.8 which might be stable and see if you can restore the model there if your file not corrupted.
this is just to start based on the response you might get futher guidlines.
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