Craftsman 42" deck 21 HP mower - engine shuts off when attempt to turn on blades

[sherwoodhunting]

My Craftsman model #917.274040 mower engine turns off instantly when I try to snap on the mower deck engagement button. I used the mower fine, parked it for two weeks and now have this issue ??????????????

Any ideas for fixing this would be greatly appreciated.

Brian