MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk

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Hi, i can’t login via web interface or update via ssh. I get this error on a terminal when i try to update nextcloudpi (sudo ncp-update)

redis is not able to save data on the disk, but have no idea how to get rid of the problem.

Running nc-update
Downloading updates
Performing updates
An unhandled exception has been thrown:
RedisException: MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error. in /var/www/nextcloud/lib/private/Memcache/Redis.php:64
Stack trace:
#0 /var/www/nextcloud/lib/private/Memcache/Redis.php(64): Redis->setex(‘232de9ee4cdbefa…’, 60, ‘["\/var\/www\/n…’)
#1 /var/www/nextcloud/lib/autoloader.php(168): OC\Memcache\Redis->set(‘OC_User’, Array, 60)
#2 [internal function]: OC\Autoloader->load(‘OC_User’)
#3 /var/www/nextcloud/lib/private/User/Session.php(223): spl_autoload_call(‘OC_User’)
#4 /var/www/nextcloud/lib/private/legacy/app.php(346): OC\User\Session->getUser()
#5 /var/www/nextcloud/lib/private/legacy/app.php(113): OC_App::getEnabledApps()
#6 /var/www/nextcloud/lib/base.php(654): OC_App::loadApps(Array)
#7 /var/www/nextcloud/lib/base.php(1068): OC::init()
#8 /var/www/nextcloud/console.php(46): require_once(’/var/www/nextcl…’)
#9 /var/www/nextcloud/occ(11): require_once(’/var/www/nextcl…’)
#10 {main}Done. Press any key…

/var/log/redis/redis-server.log report Write error saving DB on disk: no space left on device

Nextcloud version (eg, 15.0.5):
Operating system and version (Debian 9): Nextcloudpi _03-09-19 image for Odroid HC2 updated to v1.13.1
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.1):

Is this the first time you’ve seen this error? (Y/N): Y

Thank’s for your help.

konki