Looking through the logs, if these are helpful, I found these:
In ns_couchdb.log
[couchdb:error,2015-10-06T16:53:22.073+01:00,couchdb_ns_1@127.0.0.1:<0.3121.0>:couch_log:error:44]Uncaught error in HTTP request: {error,ejson_compare_nif_not_loaded}
Stacktrace: [{erlang,nif_error,[ejson_compare_nif_not_loaded],[]},
{couch_ejson_compare,less_json_nif,2,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/couchdb/couch_ejson_compare.erl"},
{line,62}]},
{couch_ejson_compare,less_json,2,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/couchdb/couch_ejson_compare.erl"},
{line,49}]},
{mapreduce_view,'-setup_views/5-fun-2-',2,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/couch_set_view/src/mapreduce_view.erl"},
{line,391}]},
{couch_btree,drop_nodes,4,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/couchdb/couch_btree.erl"},
{line,911}]},
{couch_btree,stream_kp_node,8,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/couchdb/couch_btree.erl"},
{line,923}]},
{couch_btree,fold,4,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/couchdb/couch_btree.erl"},
{line,202}]},
{couch_set_view,do_fold,5,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/couch_set_view/src/couch_set_view.erl"},
{line,894}]}]
In debug.log
[ns_server:error,2015-10-06T16:53:22.074+01:00,ns_1@127.0.0.1:<0.17094.4>:menelaus_web:loop:184]Server error during processing: ["web request failed",
{path,
"/couchBase/seenitstudio/_design/dev_user/_view/usersByEmail"},
{method,'GET'},
{type,error},
{what,
{badmatch,
{error,
{badarg,
[{erlang,list_to_integer,
["HTTP/1.1500InternalServerError",16],
[]},
{lhttpc_client,chunk_size,1,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/lhttpc/lhttpc_client.erl"},
{line,736}]},
{lhttpc_client,read_chunked_body,4,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/lhttpc/lhttpc_client.erl"},
{line,722}]},
{lhttpc_client,handle_response_body,4,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/lhttpc/lhttpc_client.erl"},
{line,484}]},
{lhttpc_client,read_response,4,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/lhttpc/lhttpc_client.erl"},
{line,446}]},
{lhttpc_client,execute,9,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/lhttpc/lhttpc_client.erl"},
{line,169}]},
{lhttpc_client,request,9,
[{file,
"/Users/jenkins/jenkins/workspace/sherlock-unix/couchdb/src/lhttpc/lhttpc_client.erl"},
{line,92}]}]}}}},
{trace,
[{capi_http_proxy,handle_request,1,
[{file,"src/capi_http_proxy.erl"},
{line,75}]},
{menelaus_web,loop,2,
[{file,"src/menelaus_web.erl"},
{line,160}]},