Kaltura_Client_Exception thrown

Invalid KS "NWE4ZGMzZjc4M2U0NGMyYWQ3OTk5MmU5YjQ3NTc5NGJjYzBiMmIwYnwxMDE7OzE0OTg1Nzg3ODg7MjsxNDk4NDkyMzg4LjI3NDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"