I have got to the admin but when I try a build a get the following error

Backing up database . . .
Backing up links, category and email database (File::Copy) ...

CGI ERROR
==========================================
Error Message : Unable to copy links backup. Reason: Bad file descriptor
Script Location : /home/wincamcs/public_html/niweb/cgi-bin/admin/nph-build.cgi
Perl Version : 5.00404

I have used fileman to protect the admin folder may this be causing the problem

Any help would be appreciated