Kaltura_Client_Exception thrown

Invalid KS "OWVmNTdiMGQ3MTM1MTMyNTQ0OGQzZDIzYmI3ZWRiZmQ0Zjg5M2JhNnwxMDE7OzE0OTgzNTc0MDQ7MjsxNDk4MjcxMDA0Ljc3Nzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"