In my case weblogic server was crashed due to space pressure at /u01/ where Weblogic was installed. then we unmount the disk and arranged space then nomount the disk. arranged.

but when i restart the server, weblogic server become crashed with above error logs.
<Critical> <WebLogicServer> <BEA-000386> <Server subsystem failed. Reason: A MultiException has 12 exceptions.
SOLUTION
Go To > $MW_home/user_projects/domains/domain_name/servers/AdminServer/data/ldap/conf>
1) Copy or Move of “relicas.prop” for save site.
2) mv replicas.prop replicas.prop_bkup
3) Start the Oracle WebLogic Admin Server.
4) Start (MS) Managed Server.
In my case Oracle WebLogic Server and their associate Managed Server are working fine. I hope it’ll solve your query.