Kaltura_Client_Exception thrown

Invalid KS "OTU2MzM0MmEwNjJjYTEzNWI4NzAzYzE2OTI3Y2YzZjMwNzhiZWU2ZHwxMDE7OzE0ODA4NDQ2ODE7MjsxNDgwNzU4MjgxLjEwNzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"