Kaltura_Client_Exception thrown

Invalid KS "YjFmODVlOGQ2YzNlZDIwN2M2MGU1MWU3MmYwMTQzODMwZjUxNTcyMXwxMDE7OzE0OTg3OTAyOTQ7MjsxNDk4NzAzODk0Ljk2Mzc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"