I would bet that there is a ship - class defined or scripted in the Single mission "Happy Times" which is now /absent/wrong/altered/whatever... in your setup.
Steve, if you open the single mission in the mission editor it well tell you - likely
EDIT:It could affect your career as well when that ship(s) is(are) spawned/scripted in the carrer - layers and try to pop up
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"I invite you to go inside this submergible hole in the water where you can nicely hide from destroyers."
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