Kaltura_Client_Exception thrown

Invalid KS "ZmMzNDBiMzUzMDhjMWQwNmFlMzRkYTRmYTk1Y2FlMmU5ZDY5ZjEzOXwxMDE7OzE0NzUxODk0MjA7MjsxNDc1MTAzMDIwLjU4NTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"