Intermittent error during the debugging

Hi, ALL,
I have a gdb 6.6 installed on the Gentoo Linux:
IgorsGentooOnNetwork igor # uname -a
Linux IgorsGentooOnNetwork 2.6.20-gentoo-r8 #1 SMP Sat Jun 2 00:28:19 PDT 2007 i686 Genuine Intel(R) CPU          
T1350   <at>  1.86GHz GenuineIntel GNU/Linux
I also have a KDevelop ver 3.4.1 (using KDE 3.5.5) installed.
All this is installed along with the GNOME.

I prepared the program using the wxGTK library, and wanted to debug it.
Unfrotunately gdb throws the error, which says:

"Debugger error

Debugger reported the following error.

Warnning: cannot insert breakpoint 0. Error accessing memory address 0xffffe420.
Input/Output error."

Now this errors appears intermittently, in different places at the
different times.

What is the cause of such issue? And how can I fix it?

Thank you.