Es + Filebeats monitor mysql error log, pipeline. Yml parse error how to resolve

Elk small white one, download ES, Kibana, FileBeats from the official website, modify mysql slow log and error log path and start, slow log can write ES, error log reported error, as shown in the picture, “D” is the first letter of the first line of pipeline. Yml, slow log used json file can be parsed. How do I solve this problem? Do I need to modify other fileBeat configuration files