Kaltura_Client_Exception thrown

Invalid KS "Y2Q1NjNkZmMwMjE2YmQxZDg2ZTMyMjEzYjJiNGI3ZjE3ZWY4ZjJjMXwxMDE7OzE0NzUxNDUxMDc7MjsxNDc1MDU4NzA3LjE3NzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"