Kaltura_Client_Exception thrown

Invalid KS "NDIxM2NjODI1MjFkNWYyY2UzZjY2MDZhMTE0NzdmMjZjZmI3NDhiN3wxMDE7OzE0ODUzNjU5Mzg7MjsxNDg1Mjc5NTM4LjM0MDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"