Uncaught exception 'cassandra\InvalidRequestException' in /var/www/html/phpcassa-master/lib/cassandra/Cassandra.php:1810

[pushkard02]

Hii,
i'm getting the below error while running a example file called basic.php.
It was working till yesterday but from today it has stopped Working and i haven't changed anything in the file.Please Help...

PHP Fatal error: Uncaught exception 'cassandra\InvalidRequestException' in /var/www/html/phpcassa-master/lib/cassandra/Cassandra.php:1810
Stack trace:
#0 /var/www/html/phpcassa-master/lib/cassandra/Cassandra.php(1810): thrift_protocol_read_binary(Object(Thrift\Protocol\TBinaryProtocolAccelerated), '\cassandra\Cass...', false)
#1 /var/www/html/phpcassa-master/lib/cassandra/Cassandra.php(1788): cassandra\CassandraClient->recv_system_add_keyspace()
#2 /var/www/html/phpcassa-master/lib/phpcassa/SystemManager.php(86): cassandra\CassandraClient->system_add_keyspace(Object(cassandra\KsDef))
#3 /var/www/html/phpcassa-master/examples/basic.php(28): phpcassa\SystemManager->create_keyspace('Keyspace1', Array)
#4 {main}

thrown in /var/www/html/phpcassa-master/lib/cassandra/Cassandra.php on line 1810