Can't use string ("source") as a HASH ref while "strict refs" in use at duck
        line 77 (#1)
    (F) Only hard references are allowed by "strict refs".  Symbolic
    references are disallowed.  See perlref.

Uncaught exception from user code:
        Can't use string ("source") as a HASH ref while "strict refs" in use at duck line 77.