Kaltura_Client_Exception thrown

Invalid KS "OThjNTQ1Yzk2YzZmODQ4OGRjMzZlOWNmODA3YmZlYThmODA1NjliNHwxMDE7OzE0NzU0MTc1NDA7MjsxNDc1MzMxMTQwLjM1MTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"