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當我嘗試添加geo_view格式文件的預覽時，出現以下錯誤。CKAN geo_view格式預覽
geojson_view工作正常。
這裏是CKAN錯誤日誌文件的切割：
$ tail ckan_default.error.1.log
[Wed Jul 01 11:28:33 2015] [error] [client 127.0.0.1] IOError: failed to write data
[Wed Jul 01 11:28:33 2015] [error] [client 127.0.0.1] mod_wsgi (pid=14483): Exception occurred processing WSGI script '/etc/ckan/default/apache.wsgi'.
[Wed Jul 01 11:28:33 2015] [error] [client 127.0.0.1] IOError: failed to write data
[Wed Jul 01 11:28:33 2015] [error] [client 127.0.0.1] mod_wsgi (pid=14483): Exception occurred processing WSGI script '/etc/ckan/default/apache.wsgi'.
[Wed Jul 01 11:28:33 2015] [error] [client 127.0.0.1] IOError: failed to write data
[Wed Jul 01 11:28:33 2015] [error] [client 127.0.0.1] mod_wsgi (pid=14483): Exception occurred processing WSGI script '/etc/ckan/default/apache.wsgi'.
[Wed Jul 01 11:28:33 2015] [error] [client 127.0.0.1] IOError: failed to write data
[Wed Jul 01 11:28:33 2015] [error] 2015-07-01 11:28:33,473 INFO [ckan.lib.base] /api/i18n/da_DK render time 0.002 seconds
[Wed Jul 01 11:28:33 2015] [error] [client 127.0.0.1] **Error - <type 'exceptions.UnboundLocalError'>: local variable 'proxy_service_url' referenced before assignment**
[Wed Jul 01 11:28:33 2015] [error] 2015-07-01 11:28:33,833 INFO [ckan.lib.base] /dataset/test-ckan-2-3-datastore/resource/08c27b5c-2130-4a57-997e-8304416de423/new_view render time 0.089 seconds
這可能看起來像寫入失敗的問題，但如果是這樣嗎？
我使用了CKAN 2.3軟件包安裝。