found the error.
Knowledge Base #3794 at quark.com
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Crash in QuarkXPress 4.1 or "Unable to Access Network" error in QuarkXPress 4.11 when attempting to open a book
Problem:
Attempting to reopen a book that was previously opened and closed causes a crash in Windows QuarkXPress 4.1 or results in the error "Unable to Access Network" in QuarkXPress 4.11.
Steps to reproduce:
1. Launch QuarkXPress W 4.1 and create a new document.
2. Save the document as Document1.qxd.
3. Close the document. Select File>New>Book and create a new book called "Book."
4. In the Books palette, click on the Add Chapter button and add the Document1.qxd to the book.
5. Close the book, then reopen it.
Result:
QuarkXPress quits with a GPF error (Win 95) or a Dr. Watson error (Win NT) in QuarkXPress 4.1 or generates an "Unable to Access Network" error in QuarkXPress 4.11..
Explanation:
In the test case, the IPX/SPX protocol was not installed. According to R&D, QuarkXPress W 4.0x (4.0-4.04) requires IPX/SPX be loaded in order to open a book. QuarkXPress W 4.1 will crash when opening a book without IPX/SPX installed, and QuarkXPress W 4.11 will display the error "Unable to Access Network. [116]" when opening a book without IPX/SPX installed. This error message is actually an "erroneous "error. The error that R&D wanted to put in here is: "IPX/SPX protocol is missing. Books and / or Chapters will not be shareable across a network," but there was not enough time to localize the error string
regards,
The complete list of their error messages is at http://www.quark.com/support/techinfo/technotes.cfm#qxp_err