Error message

• Warning: Attempt to assign property of non-object in MemCacheDrupal->valid() (line 127 of /srv/www/freistilbox/clients/c11000/s2550/.deploy/releases/ca5f1bd9bccfd989df2e0d1950f8367e2deb57c3/docroot/sites/all/modules/contrib/memcache/memcache.inc).
• Warning: Attempt to assign property of non-object in MemCacheDrupal->valid() (line 130 of /srv/www/freistilbox/clients/c11000/s2550/.deploy/releases/ca5f1bd9bccfd989df2e0d1950f8367e2deb57c3/docroot/sites/all/modules/contrib/memcache/memcache.inc).
• Notice: Trying to get property of non-object in MemCacheDrupal->valid() (line 143 of /srv/www/freistilbox/clients/c11000/s2550/.deploy/releases/ca5f1bd9bccfd989df2e0d1950f8367e2deb57c3/docroot/sites/all/modules/contrib/memcache/memcache.inc).
• Notice: Trying to get property of non-object in MemCacheDrupal->valid() (line 151 of /srv/www/freistilbox/clients/c11000/s2550/.deploy/releases/ca5f1bd9bccfd989df2e0d1950f8367e2deb57c3/docroot/sites/all/modules/contrib/memcache/memcache.inc).
• Notice: Trying to get property of non-object in MemCacheDrupal->valid() (line 154 of /srv/www/freistilbox/clients/c11000/s2550/.deploy/releases/ca5f1bd9bccfd989df2e0d1950f8367e2deb57c3/docroot/sites/all/modules/contrib/memcache/memcache.inc).
• Notice: Trying to get property of non-object in MemCacheDrupal->valid() (line 154 of /srv/www/freistilbox/clients/c11000/s2550/.deploy/releases/ca5f1bd9bccfd989df2e0d1950f8367e2deb57c3/docroot/sites/all/modules/contrib/memcache/memcache.inc).
• Notice: Trying to get property of non-object in MemCacheDrupal->valid() (line 174 of /srv/www/freistilbox/clients/c11000/s2550/.deploy/releases/ca5f1bd9bccfd989df2e0d1950f8367e2deb57c3/docroot/sites/all/modules/contrib/memcache/memcache.inc).