General 3.8 new motor and crank no start no fuel or spark

02 mustang 3.8 v6 I was hired to remove the blown motor and install the new one.
I was told that the old motor blew up and that everything else is fine.
I put everything in the qay it came out and now the pats light is on the dash flashing.
What are the possible reasons for this?
 

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