Kaltura_Client_Exception thrown

Invalid KS "NmI1ZTM0YzQyNjVjMjI2M2MxY2U1OGM0ZjhhYTJlNWRjYjBmMmRjZHwxMDE7OzE0ODEyMDA1NjU7MjsxNDgxMTE0MTY1LjE4MTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"