hello perl monks help me solve it error: Can't call method "CustomDocumentProperties" on an undefined value at powerpoint .pl line 10. code is below please solve it thanks in advance 
 use strict;
 use Win32::OLE qw(in);
use Win32::OLE::Const 'Microsoft Office';

 my $Word = Win32::OLE->new('Word.Application', 'Quit');
 my $PowerPoint = Win32::OLE->new('PowerPoint.Application', 'Quit');
 my $Watermark = $Word->Documents->Open('C:\Users\sumit\Desktop\test\D
+oc1.doc');
 my $ppt = $PowerPoint->Presentations->Open('C:\Users\sumit\Desktop\te
+st\Presentation1.ppt');
 
 my $Powerprop = $ppt->CustomDocumentProperties();

 foreach my $Property (in $Watermark->CustomDocumentProperties) {
    my $Name = $Property->Name;
     local $Win32::OLE::Warn = 0;
     my $Value = $Property->Value;
#     $Property->{Value}='test';
     $Value = '***Error***' if Win32::OLE->LastError;
     $Value = '<undef>' unless defined $Value;



 $Powerprop->Invoke('Add',{
             Name => $Name, LinkToContent => 0, Type => 4, Value => $V
+alue
            }
        );

    printf "%s %s = %s\n", $Name, '.' x (40-length($Name)), $Property-
+>Value;
 }
 $ppt->Save();

 $ppt->Close();
 $PowerPoint->Quit();

 $Watermark->close();
 $Word->Quit();

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In reply to win32 ole and power point by sumit07

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