我是CKAN的新手，在使用ckan 2.3和solr 5.0.0运行CKAN m时发现错误，请帮我解决这个错误：
SolrException: HTTP code=404, reason=Not Found
2015-06-24 10:28:59,194 WARNI [ckan.lib.search] Problems were found while connecting to the SOLR server
2015-06-24 10:29:01,040 ERROR [ckan.lib.search.common] HTTP code=404, reason=Not Found
Traceback (most recent call last):
File "/usr/lib/ckan/default/src/ckan/ckan/lib/search/common.py", line 51, in is_available
conn.query("*:*", rows=1)
File "/usr/lib/ckan/default/local/lib/python2.7/site-packages/solr/core.py", line 703, in query
return self.select(*args, **params)
File "/usr/lib/ckan/default/local/lib/python2.7/site-packages/solr/core.py", line 798, in __call__
xml = self.raw(**params)
File "/usr/lib/ckan/default/local/lib/python2.7/site-packages/solr/core.py", line 823, in raw
rsp = conn._post(self.selector, request, conn.form_headers)
File "/usr/lib/ckan/default/local/lib/python2.7/site-packages/solr/core.py", line 639, in _post
return check_response_status(self.conn.getresponse())
File "/usr/lib/ckan/default/local/lib/python2.7/site-packages/solr/core.py", line 1097, in check_response_status
raise ex
SolrException: HTTP code=404, reason=Not Found
2015-06-24 10:29:01,041 WARNI [ckan.lib.search] Problems were found while connecting to the SOLR server