Kaltura_Client_Exception thrown

Invalid KS "OTVjZTBkOTE2Yzc5NzM4ZGJlZjZjNzc4OGRhNGY1MTFlYmJmODY5N3wxMDE7OzE0NzUzNzk4OTY7MjsxNDc1MjkzNDk2Ljk4MzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"