Invalid face text property value

[PT]

I have my own completion function which displays possible completions in a  
split window. It works fine, however when I use a popup frame for showing  
the completions (I create a new frame with make-frame) then I have the  
following lines in the Messages buffer:

  Invalid face text property value: font-lock-variable-name-face
  Invalid face text property value: font-lock-type-face
  Invalid face text property value: font-lock-variable-name-face
  Invalid face text property value: font-lock-function-name-face
  Invalid face text property value: font-lock-variable-name-face

I don't do anything with these font-lock-variables, so I don't see the  
connection. My function works fine by the way, but these strange messages  
bother me.

Is there a known font face issue when creating new frames? It's GNU Emacs  
21.3.1 (i386-pc-linux-gnu, X toolkit, Xaw3d scroll bars).

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