Go to OpenKM Administration > Utilities > Database query and execute:
update OKM_CONFIG set CFG_KEY='edx.base.uuid' where CFG_KEY='e2d.base.uuid';
update OKM_CONFIG set CFG_KEY='edx.email.body' where CFG_KEY='e2d.email.body';
update OKM_CONFIG set CFG_KEY='edx.email.subject' where CFG_KEY='e2d.email.subject';
update OKM_CONFIG set CFG_KEY='edx.inbox.name' where CFG_KEY='e2d.inbox.name';
update OKM_CONFIG set CFG_KEY='edx.public.name' where CFG_KEY='e2d.public.name';
update OKM_CONFIG set CFG_KEY='edx.template.folder.inbox.uuid' where CFG_KEY='e2d.template.folder.inbox.uuid';
update OKM_CONFIG set CFG_KEY='edx.template.folder.public.uuid' where CFG_KEY='e2d.template.folder.public.uuid';