全新安装,有错误日志

全新centos7 minimal 系统 全新安装的
wget --no-check-certificate https://raw.githubusercontent.com/haiwen/seafile-server-installer/master/seafile_centos
bash seafile_centos 6.3.2

2018-09-05 17:55:36,360 [ERROR] django.pylibmc:132 get MemcachedError: error 3 from memcached_get(:1:CUR_TOPINFO): CONNECTION FAILURE
Traceback (most recent call last):
File “/usr/lib/python2.7/site-packages/django_pylibmc/memcached.py”, line 130, in get
return super(PyLibMCCache, self).get(key, default, version)
File “/opt/seafile/seafile-server-6.3.2/seahub/thirdpart/django/core/cache/backends/memcached.py”, line 79, in get
val = self._cache.get(key)
ConnectionError: error 3 from memcached_get(:1:CUR_TOPINFO): CONNECTION FAILURE
2018-09-05 17:55:36,434 [ERROR] django.pylibmc:146 set MemcachedError: error 47 from memcached_set: SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY
Traceback (most recent call last):
File “/usr/lib/python2.7/site-packages/django_pylibmc/memcached.py”, line 140, in set
**COMPRESS_KWARGS)
ServerDown: error 47 from memcached_set: SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY
2018-09-05 17:55:36,498 [ERROR] django.pylibmc:132 get MemcachedError: error 47 from memcached_get(:1:autofilled): SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY
Traceback (most recent call last):
File “/usr/lib/python2.7/site-packages/django_pylibmc/memcached.py”, line 130, in get
return super(PyLibMCCache, self).get(key, default, version)
File “/opt/seafile/seafile-server-6.3.2/seahub/thirdpart/django/core/cache/backends/memcached.py”, line 79, in get
val = self._cache.get(key)
ServerDown: error 47 from memcached_get(:1:autofilled): SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY
2018-09-05 17:55:36,573 [ERROR] django.pylibmc:167 set_many MemcachedError: error 47 from memcached_set_multi: SERVER HAS FAILED AND IS DISABLED UNTIL TIMED RETRY

/opt/seafile/logs/seahub.log 出现这个错误 谁知道原因吗