Kaltura_Client_Exception thrown

Invalid KS "MmQyNzkwOGVlMGE0NzlmOWM2NzY5MjBjNjRiM2UwNzA1MmFiNjA2Y3wxMDE7OzE0NzQ5Njc4Mzg7MjsxNDc0ODgxNDM4LjA3Mzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"