Let's say something like this is being returned by your Perl script.

Reference found where even-sized list expected at example.pl line 16.

This typically occurs when the script contains something like this.

my %hash = {};

In Perl, there are 3 different kinds of hashes.

• A regular hash, which is defined by the % and ( ) characters, such as %hash = ( );
• A reference hash, which is defined with the $ and { } characters, such as $hash = { };
• A hash array, which is defined with the % and [ ] characters, such as %hash = [ ];

This can be resolved by correcting the script to define a regular hash.

my %hash = ();

Or define a reference hash.

my $hash = {};

Or define a hash array.

my %hash = [];