Try to add a -name option in your AddLabel. In Win32::GUI 0.0.558 a name option is required for any windows.
Laurent. ----- Original Message ----- From: "Becker, Joern {DR-N~Mannheim}" I wrote a small Win32::GUI Testprogram, which works well with perl 5.6.0/NT. Now i have changed to perl 5.8.0/NT and want to use this program, but now when the program starts the first Window of Win32::GUI the following error occurs: Perl: perl.exe - Error in application Instruction in "0x78...." points to mem "0x00000000". The command "read" couldn't executed. Click "OK" to close application. The DOS-Terminal-Output is ...>perl win32tst.pl Hello World! CWD: I:\Proj\ApCv\PerlDos MS-Domain: RBAMOUSER GUI-Version: 0.0.558 ...> I think there is a real dump/trivial error, but can't imagine what will produce this "Null-Pointer assignment".