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我正在尝试使用erlang语言在CouchDB中创建一个视图文档。我已在配置中启用了erlang query_server。当我创建文档时，将语言设置为javascript，如果我转到设计文档并将其更改为erlang，则会从CouchDB中收到错误消息。

fun({Doc}) ->
    case proplists:get_value(<<"type">>, Doc) of
    undefined ->
        ok;
    Type ->
        Identifiers = proplists:get_value(<<"institution">>, Doc),
        lists:foreach(fun(Doc) 
        -> 
        Emit(doc._id,Doc);
    _ ->
        ok
    end.

发现的错误是：

Error running query. Reason: ({badmatch,[<<"error">>, {9,erl_parse,["syntax error before: ","'.'"]}, {9,erl_parse,["syntax error before: ","'.'"]}]}) [{couch_query_servers,'-start_doc_map/3-fun-0-',2, [{file,"src/couch_query_servers.erl"},{line,62}]}, {lists,foreach,2,[{file,"lists.erl"},{line,1337}]}, {couch_query_servers,start_doc_map,3, [{file,"src/couch_query_servers.erl"},{line,61}]}, {couch_mrview_updater,start_query_server,1, [{file,"src/couch_mrview_updater.erl"},{line,231}]}, {couch_mrview_updater,map_docs,2, [{file,"src/couch_mrview_updater.erl"},{line,184}]}]