The part after "at" probably lists a line number from your code, or from the module you're using. But you showed no code in your post. I think we're going to need more information than you've provided if we are to help you with this issue. Please post a minimally constructed executable snippet of code that replicates your error.

Do you mean LWP, instead of LPW? I did a search for LPW and Perl, and came up with the same blank that my mind produced when I read your question.

Googling for the error message returns matches mentioning LWP.

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.
[download]

There are three related problems:

• An explicit declaration of a function and its definition don't match:

  >perl -we"sub trim(@); sub trim($) {}"
  Prototype mismatch: sub main::trim (@) vs ($) at -e line 1.
  [download]

  There's no problem if the declaration has no prototype, so this isn't the cause of your problem.

• An implicit declaration of a function and its definition don't match:

  >perl -we"trim('abc'); sub trim($) {}"
  main::trim() called too early to check prototype at -e line 1.
  [download]

• A function's is defined twice with different prototypes:

  >perl -we"sub trim {} sub trim($) {}"
  Prototype mismatch: sub main::trim: none vs ($) at -e line 1.
  Subroutine trim redefined at -e line 1.
  [download]

  If so, you'll also get a "Subroutine trim redefined" warning. (You do have warnings turned on, right?)

The last problem is the only one I can get to result in "none vs ($)". The solution, of course, is to get rid of the trim you don't want. Note that you might be importing one (or both) from a module.