keep getting connection refused

[verybigelephants]

when i run the test.php receive no answer from the curl to 127.0.0.1:8080. when i look into the console, i get

ServerSelectionTimeoutError: localhost:27017: [Errno 111] Connection refused

what is the problem? the server answers correctly when there's secret hash mismatch. when it's correct i just get connection refused

i've got a feeling that it wants to connect to some database. but what database? where is its configuration? i see no databaser requirements, neither here, nor in the https://github.com/gunthercox/ChatterBot

[verybigelephants]

installed mongodb and it works now. it should really be mentioned somewhere. this has very poor documentation