Kaltura_Client_Exception thrown

Invalid KS "OTM1NWFkMmJlZjJjMDhjZjgxODRjYjNjMGNlOGZiNjE4ZTlmNGQ2ZXwxMDE7OzE0NzUzNzg5Mjc7MjsxNDc1MjkyNTI3LjE2MzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"