Kaltura_Client_Exception thrown

Invalid KS "ZjJlYzQ2NDU5NjhiZDdhMjFkMTU1Y2JjZTgxYzU1MmRlOWFhZWI2NXwxMDE7OzE0ODUxMTU5MjU7MjsxNDg1MDI5NTI1LjMxOTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"