Kaltura_Client_Exception thrown

Invalid KS "NjRkMGU4NDNmNDk2M2IyZGQwZGY0N2YxZGMxZDMyZWJmMGE5MGNiNHwxMDE7OzE0NzQ4NjkzODg7MjsxNDc0NzgyOTg4LjMxODI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"