Kaltura_Client_Exception thrown

Invalid KS "ZmFjYjlmNGMzNzkxMmYxNjM2YzU4OGE5M2MxZmRkMWJlY2FmODFkMXwxMDE7OzE0OTU3MDA5MjA7MjsxNDk1NjE0NTIwLjIyMTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"