Kaltura_Client_Exception thrown

Invalid KS "MzAyOGRhNzZlZDYzYWMyM2MxOTA2OGY5NTNiYzUyNGQ5ODdkZjcyOXwxMDE7OzE0OTU2NTk2Mjc7MjsxNDk1NTczMjI3LjA1NjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"