Debug perl package in Apache

[Wang, Pin-Chieh]

Hi,
I build an Apache with Mod_Perl under DSO in Solaris. Apache seems works
fine. But
I now have a problem when AuthenNISPlus.pm get called and was not be able to
get password table(I think).

I have the following setting in httpd.conf
         <Location /web >
              AuthName "[Web for Unix Users]"
              AuthType Basic
              PerlSetVar NISPlus_Passwd_Table passwd.org_dir
              PerlSetVar NISPlus_Group_Table group.org_dir
              PerlSetVar NISPlus_DEBUG 1
              PerlAuthenHandler Apache::AuthenNISPlus
              require group devusers sysadmin
              Order deny,allow
              Deny from all
              Allow from all
         </Location>

But AuthenNISPlus.pm exited with "Not an ARRAY reference at line 58
look at this program from line 57 are

  foreach ($pwd_table->list()){
    if(@{$_}[0] eq $name){
      $pwd = @{$_}[1];
      $group = @{$_}[3];
      last;

Any body has any ideals?  Also How can I debug an perl package under this
environment?

Appreciated for any help

Thanks,

PC