Kaltura_Client_Exception thrown

Invalid KS "MTJhODAzYjc2NTk0N2JlYjZiMmQ5MzM5MmRhOGQzMDE4ZTdhMmI3OHwxMDE7OzE0NzUyNzQxMTA7MjsxNDc1MTg3NzEwLjU3ODY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"