Kaltura_Client_Exception thrown

Invalid KS "ZTI2YjU0NGQ0N2FkNzAwMDZkODdhMjQ3NDYwOTU5N2E2ZDA4ZDliYnwxMDE7OzE0OTA0MjI3NDA7MjsxNDkwMzM2MzQwLjI2MDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"