Invalid config key "mongoUrl"

[aresa7796]

Failed to load c++ bson extension, using pure JS version
F:\node_space\nodejs-starter\lib\config\index.js:43
throw new Error('Invalid config key "' + key + '"');
^

Error: Invalid config key "mongoUrl"
at config (F:\node_space\nodejs-starter\lib\config\index.js:43:9)
at configuration (F:\node_space\nodejs-starter\lib\setup\index.js:136:12)
at Object. (F:\node_space\nodejs-starter\lib\boot\index.js:31:27)
at Module._compile (module.js:541:32)
at Object.Module._extensions..js (module.js:550:10)
at Module.load (module.js:458:32)
at tryModuleLoad (module.js:417:12)
at Function.Module._load (module.js:409:3)
at Module.require (module.js:468:17)
at require (internal/module.js:20:19)