Kaltura_Client_Exception thrown

Invalid KS "ZTkxM2VlMzUxZjQ5ZjQ4OTQ3YjU4Mzg2NmY5OWYzOGE0N2FkNTgwYXwxMDE7OzE0ODgzNjU2NzY7MjsxNDg4Mjc5Mjc2Ljk5Njk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"