When using the Perl module Net::Cassandra::Easy to interface with Cassandra I use the following code to read colums col[123] from rows row[123] in column-family Standard1:

my $cassandra = Net::Cassandra::Easy->new(keyspace => 'Keyspace1', server => 'localhost');
$cassandra->connect();
my $result = $cassandra->get(['row1', 'row2', 'row3'], family => 'Standard1', byname => ['col1', 'col2', 'col3']);

This works as expected.

However, when trying to insert row row1 with ..

$result = $cassandra->mutate(['row1'], family => 'Standard1', insertions => { "col1" => "Value to set." });

.. I get the error message Can't use string ("0") as a SCALAR ref while "strict refs" in use at .../Net/GenThrift/Thrift/BinaryProtocol.pm line 376.

What am I doing wrong?