1.Systemversion CentOs7.9  2.CheckwhetherthecurrentsystemhasanErlangenvironmentpre-installed erl-version 3.Thefollowingcommandsareornotexecuted yum-yremoveerlang- 3.1.Deleteeverythingthatcanbedeletedunderthepathunderthesystem rm-rf/usr/lib64/erlang rm-rf/var/lib/rabbitmq rm-rf/usr/local/erlang ...