Kaltura_Client_Exception thrown

Invalid KS "YTRmNWZmM2VkYTgxM2JiYTJjZDQwMDRiNjI0ZWU5MjEyMGQ2MjU1OXwxMDE7OzE0OTAzNzM3Nzg7MjsxNDkwMjg3Mzc4LjIzNzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"