With your support, i understood now from where is coming the issue.

Sometimes it's very useful to simply see what you're doing. A humble print statement can help:

my $path = "C:/Users/user1/Documents/TESTPERL";
...
my $url = some_func(...);
...
my $filename = "$path/Website-$url.png";
print "DEBUG: screenshot filename: '$filename'";  # FOR DEBUG only
$driver->capture_screenshot($filename);
...
[download]

Had you seen this output during debugging, it would probably have been immediately obvious that "... the png doc cannot store the url name as is".

See also the Basic debugging checklist; these techniques will allow you to support yourself.