Web login doesnt work after upgrade from 2.2.14 to 3.0.89​

Hi,
I upgraded omv with omv-release-upgrade and it worked fine,server come up and i can ssh into it , but web login is failing with this message:
Failed to connect to socket: No such file or directory

Error #0:exception 'OMV\Rpc\Exception' with message 'Failed to connect to socket: No such file or directory' in /usr/share/php/openmediavault/rpc/rpc.inc:140Stack trace:#0 /var/www/openmediavault/rpc/session.inc(56): OMV\Rpc\Rpc::call('UserMgmt', 'authUser', Array, Array, 2, true)#1 [internal function]: OMVRpcServiceSession->login(Array, Array)#2 /usr/share/php/openmediavault/rpc/serviceabstract.inc(124): call_user_func_array(Array, Array)#3 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod('login', Array, Array)#4 /usr/share/php/openmediavault/rpc/proxy/json.inc(95): OMV\Rpc\Rpc::call('Session', 'login', Array, Array, 3)#5 /var/www/openmediavault/rpc.php(45): OMV\Rpc\Proxy\Json->handle()#6 {main}

As far as I read i missed removing plugin not anymore supported in omv 3 like owncloud. Now i need to understand how to remove such plugin and how to restore weblogin.
Can you please drive me how to fix the problem?
Thanks

here you are.
Thanks

ii openmediavault 3.0.89 all Open network attached storage solution
ii openmediavault-autoshutdown 3.1.4 all OpenMediaVault AutoShutdown Plugin
ii openmediavault-backup 3.6 all backup plugin for OpenMediaVault.
ii openmediavault-keyring 1.0 all GnuPG archive keys of the OpenMediaVault archive
ii openmediavault-links 1.5 all OpenMediaVault links plugin
ii openmediavault-minidlna 3.3.10 all OpenMediaVault miniDLNA (DLNA server) plugin
rc openmediavault-mpd 1.0.3 all OpenMediaVault MPD (Music Player Daemon) plugin
ii openmediavault-omvextrasorg 3.4.29 all OMV-Extras.org Package Repositories for OpenMediaVault
ii openmediavault-owncloud 2.0.3 all OpenMediaVault ownCloud plugin
ii openmediavault-plexmediaserver 3.8.1 all OpenMediaVault Plex Media Server plugin
ii openmediavault-shellinabox 3.4 all Web-based SSH client.
ii openmediavault-transmissionbt 3.0.9 all OpenMediaVault Transmission (BitTorrent client) plugin.
ii openmediavault-webdav 3.0.3 all OpenMediaVault WebDAV plugin.
ii openmediavault-wol 3.2 all OpenMediaVault WOL plugin

yes u r right, but unfortunately, as i wrote in my post, I skipped that step before starting upgrade to erasmus and now would fix avoiding to lose installation.
Thanks

no problem...at the end it Is my fault i will remove such plugins and check if it will solve issue with weblogin.
I will let u know asap.
Thanks

Weblogin works now! Now i am having with mldonkey that is not working with omv 3.
Thanks for supporting me to restore weblogin