This just means that you still have the lone < somewhere above the line you show us.

Again, my suggestion is to first make a backup copy, and then start ripping out the parts above that line until you have found the line that makes Perl think you want to use a <...> operator. Alternatively, you can start with a line containing a > and slowly move that upwards to find the line where the lone < is. Most likely, the offending line is some malformed/badly quoted HTML.

As your file has at least 144 lines, I will not invite you to post it here. Reducing the script by removing irrelevant lines is your first task.

Hum, I start a new script from the begin but I got Message d'erreur: couldn't create child process: 720002: test.pl here is the code :

#!/usr/bin/perl
use strict;
use warnings;
 
print "Content-type: text/html\n\n";
 
print "Hello World!";
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Unbelievable error ..

Unbelievable error ..

Quite so - it is indeed very hard to believe. Your code as posted works fine:

$ cat 11149222.pl
#!/usr/bin/perl
use strict;
use warnings;
 
print "Content-type: text/html\n\n";
 
print "Hello World!";

$ perl 11149222.pl
Content-type: text/html

Hello World!$ perl -v | head -3

This is perl 5, version 34, subversion 0 (v5.34.0) built for x86_64-li
+nux-thread-multi

$
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---

🦛

This looks like you didn't use the correct incantation to start a Perl script.

You didn't mention what operating system and which Perl version you use, which makes it difficult to help.

Some subtle hints make me assume it's some Windows version and XAMPP. If that's the case, you need to look into your XAMPP configuration and documentation. And ISTR Apache can be configured to obey the shebang line under Windows, in which case it should contain something like

#!c:/xampp/perl/bin/perl.exe
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(modify according to wherever your perl.exe is located)