WUC-1 Component has no parent frame.

Hi guys,
a have a problem using webutil (Webutil_File_Transfer.DB_To_Client).
I subclassed the webutil object library and attached de webutil .pll in the form.
When I ran the form, I receive the error: "WUC-1 Component has no parent frame"
Any idea what´s the problem ?
The form runs on the AIX Server . Forms 10.1.2 and Database 10g.
Tks.
Franco

just adding more information:
when I used WEBUTIL_CLIENTINFO.GET_USER_NAME and Webutil_File_Transfer.GET_WORK_AREA ... for example, the forms works fine!
Tks
Franco

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