You can always search perldiag for unknown error messages (that's what diagnostics does)

The closest I was able to find (searching for '@INC') was

Can’t locate auto/%s.al in @INC

but I have problems to decrypt the description.

           (F) A function (or method) was called in a package which al
+lows
           autoload, but there is no function to autoload.  Most proba
+ble
           causes are a misprint in a function/method name or a failur
+e to
           "AutoSplit" the file, say, by doing "make install".
[download]

I'm ignorant about how to "allow autoload" w/o actually having provided a sub AUTOLOAD somewhere.

Probably either a weird case of inheritance mess up or some kind of XS magic (?).

edit

ah, google is my friend! )

--> What is the /auto/ directory used for? see also AutoSplit

lazy me! (I blame LanX! ;-)