Kaltura_Client_Exception thrown

Invalid KS "YWE5ZDIxZWFmMjQ2MDlmOWU4ZDdkODMzMDk0OWNmZTA2ODdlMzIxY3wxMDE7OzE0NzUxNDUyODQ7MjsxNDc1MDU4ODg0LjcxNDE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"