Kaltura_Client_Exception thrown

Invalid KS "YmM2ZWE2NjVlZWJlNjZkMmIwMjI1ZTY1Y2U0YzFkNTk1ZGVmYjI1MXwxMDE7OzE0NzUwODM4OTg7MjsxNDc0OTk3NDk4Ljg3NTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"