include can't work

[Nala Ginrut]

I encountered a bug while trying include some file:
--------------------------cut------------------------
scheme@(guile-user)> (include "aa.scm")
While compiling expression:
ERROR: In procedure string-length: Wrong type argument in position 1
(expecting string): #f
--------------------------end------------------------

The content of aa.scm is trivial but I still list it:
------------------cut---------------
(let ((x (expt 2 10)))
  (display x))
------------------end---------------
Don't argue with the meaning of aa.scm please, it's unrelated to this
'include' issue.

Guile version: GNU Guile 2.0.9.92-d3606

Thanks!