Any other ideas of what may be the cause?

Exactly what the message says, a prototype mismatch 


$ perl -Mdiagnostics -e " sub trim(); sub trim($){warn@_} ; "
Prototype mismatch: sub main::trim () vs ($) at -e line 1 (#1)
    (S prototype) The subroutine being declared or defined had previou
+sly been
    declared or defined with a different function prototype.

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In reply to Re: Prototype mismatch: sub main::trim: none vs ($) at by Anonymous Monk
in thread Prototype mismatch: sub main::trim: none vs ($) at by Anonymous Monk

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