(node:22240) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'toString' of undefined
    at l (/home/yiyi/Documents/CPEN-321/node_modules/geolib/lib/index.js:1:1859)
    at t (/home/yiyi/Documents/CPEN-321/node_modules/geolib/lib/index.js:1:3252)
    at S (/home/yiyi/Documents/CPEN-321/node_modules/geolib/lib/index.js:1:3948)
    at Module.D (/home/yiyi/Documents/CPEN-321/node_modules/geolib/lib/index.js:1:5951)
    at /home/yiyi/Documents/CPEN-321/core/suggestion.js:26:29
    at Array.filter (<anonymous>)
    at Object.exports.suggestNearbyUser (/home/yiyi/Documents/CPEN-321/core/suggestion.js:21:19)
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
    at async /home/yiyi/Documents/CPEN-321/controllers/user.js:48:46
(node:22240) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:22240) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
POST /user/login - - ms - -

web_1  | Time:  1574091588463
web_1  | GET /user/5dd284b4993f92035815be24/suggested-friends 400 75.260 ms - 11
web_1  | GET /user/5dd284b4993f92035815be24/friendlist - - ms - -
web_1  | TypeError: Cannot read property 'location' of null
web_1  |     at userList.filter (/starter/core/suggestion.js:27:28)
web_1  |     at Array.filter (<anonymous>)
web_1  |     at Object.exports.suggestNearbyUser (/starter/core/suggestion.js:21:27)
web_1  |     at <anonymous>
web_1  |     at process._tickCallback (internal/process/next_tick.js:189:7)

D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.study_buddy, PID: 13668
    java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference
        at com.example.study_buddy.fragments.FriendsFragment$2.onResponse(FriendsFragment.java:118)
        at retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall$1$1.run(ExecutorCallAdapterFactory.java:70)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:214)
        at android.app.ActivityThread.main(ActivityThread.java:7356)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
D/EGL_emulation: eglMakeCurrent: 0xebbd54e0: ver 2 0 (tinfo 0xebc34b40)
I/Process: Sending signal. PID: 13668 SIG: 9
Process 13668 terminated.

web_1  | [2019-11-27T11:26:52.790] [DEBUG] User Controller - {
web_1  |   access_token: 'ya29.Il-yB7l4U4va5BMCcI6sdn8_VlP6onf2hcIAlO5xZgZf2nyZ7BMCRGMclZqXp7eoKBTXHc_Aj-dZBSKOw-c9edyPdWnLpuf7zXT-miuCuHKElIAciigHAqPRuuXE5ry
BSg',
web_1  |   scope: 'https://www.googleapis.com/auth/drive.appdata openid https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/userinf
o.profile https://www.googleapis.com/auth/calendar.readonly',
web_1  |   expires_in: '3600',
web_1  |   token_type: 'Bearer',
web_1  |   id_token: 'eyJhbGciOiJSUzI1NiIsImtpZCI6ImRlZThkM2RhZmJmMzEyNjJhYjkzNDdkNjIwMzgzMjE3YWZkOTZjYTMiLCJ0eXAiOiJKV1QifQ.eyJpc3MiOiJodHRwczovL2FjY291bnRzL
mdvb2dsZS5jb20iLCJhenAiOiI1NzIzMDQ3ODYzMjQtZnJodnE3cmphNTJhMGVmMGVtOHYxa2w4MWpqN2FmODEuYXBwcy5nb29nbGV1c2VyY29udGVudC5jb20iLCJhdWQiOiI1NzIzMDQ3ODYzMjQtZnJodnE
3cmphNTJhMGVmMGVtOHYxa2w4MWpqN2FmODEuYXBwcy5nb29nbGV1c2VyY29udGVudC5jb20iLCJzdWIiOiIxMTM1MTYwNjA1NTQ0MzI4MzA3MjUiLCJlbWFpbCI6ImFsYmVydC55YW55eUBnbWFpbC5jb20iL
CJlbWFpbF92ZXJpZmllZCI6dHJ1ZSwiYXRfaGFzaCI6ImoxdlZNRklwRk9aU1E0SEVPREdFTkEiLCJuYW1lIjoiWWl5aSBZYW4iLCJwaWN0dXJlIjoiaHR0cHM6Ly9saDMuZ29vZ2xldXNlcmNvbnRlbnQuY29
tL2EtL0FBdUU3bUFERm5SRWNnejVCcVg3clN1c0FVOGZjVjhYZkV0dHFaNkQxMldHUXc9czk2LWMiLCJnaXZlbl9uYW1lIjoiWWl5aSIsImZhbWlseV9uYW1lIjoiWWFuIiwibG9jYWxlIjoiZW4tR0IiLCJpY
XQiOjE1NzQ4NTQwMTIsImV4cCI6MTU3NDg1NzYxMn0.EiqCnXh-WTEtliy-ob7cpY-jyHvQ5AjeY-IYE61utP80nG16MJxhnhnXMydPZDlf1E45TgcI2Laj9ejaijJDs9-9aKFfv5I-xTRL9CIJIworDNLQ-LJ
0NC9LaYijf09VMPgprArYnFsPH9nuXqXuT5KY7QRmWY6orwLkMg_ZzeqjIV156nonz2COETEDX_DT0GIPyQn9DB5Q0heXx3iY06bEHuuFOflFgtJkcf1XDUUWsKCekwgtd_Y2ypLGMLnLrB2d5fAOKc0RXTj32
pdd-xfoZ6k-Z2ORBQETgkslbPY2w9hEwtOxLFMeHdu3KHXN080BfJDNb1d-yzaeyptSpg',
web_1  |   firstName: 'Yiyi',
web_1  |   lastName: 'Yan',
web_1  |   email: '[email protected]'
web_1  | }
web_1  | [2019-11-27T11:26:53.010] [DEBUG] Google Calendar - []
web_1  | [2019-11-27T11:26:53.010] [DEBUG] Google Calendar - []
web_1  | [2019-11-27T11:26:53.012] [ERROR] User Controller - TypeError: Converting circular structure to JSON
web_1  |     --> starting at object with constructor 'NativeTopology'
web_1  |     |     property 's' -> object with constructor 'Object'
web_1  |     |     property 'sessionPool' -> object with constructor 'ServerSessionPool'
web_1  |     --- property 'topology' closes the circle
web_1  | POST /user/google-calendar 500 302.139 ms - 294 

web_1  | > [email protected] start /starter
web_1  | > node app.js
web_1  | 
web_1  | Connected: MongoDB is connected at mongodb+srv://user:[email protected]
/populate?retryWrites=true&w=majority.
web_1  | Running: Socket.io app is running on port 3000
web_1  | Running: App is running at http://localhost:8080 in development mode
web_1  |   Press CTRL-C to stop
web_1  | 
web_1  | Time:  1574082144028
web_1  | POST /user/login 200 99.532 ms - 808
web_1  | Time:  1574082146981
web_1  | Time:  1574082146985
web_1  | events.js:183
web_1  |       throw er; // Unhandled 'error' event
web_1  |       ^
web_1  | 
web_1  | TypeError: Cannot read property 'suggestedFriendList' of null
web_1  |     at User.findById (/starter/controllers/user.js:302:39)
web_1  |     at /starter/node_modules/mongoose/lib/model.js:4604:16
web_1  |     at /starter/node_modules/mongoose/lib/query.js:4351:12
web_1  |     at model.Query.Query._completeOne (/starter/node_modules/mongoose/lib/query.js:2054:12
)
web_1  |     at Immediate.Query.base.findOne.call (/starter/node_modules/mongoose/lib/query.js:2116
:10)
web_1  |     at Immediate._onImmediate (/starter/node_modules/mquery/lib/utils.js:116:16)
web_1  |     at runCallback (timers.js:810:20)
web_1  |     at tryOnImmediate (timers.js:768:5)
web_1  |     at processImmediate [as _immediateCallback] (timers.js:745:5)
web_1  | npm ERR! code ELIFECYCLE
web_1  | npm ERR! errno 1
web_1  | npm ERR! [email protected] start: `node app.js`
web_1  | npm ERR! Exit status 1
web_1  | npm ERR! 
web_1  | npm ERR! Failed at the [email protected] start script.
web_1  | npm ERR! This is probably not a problem with npm. There is likely additional logging outpu
t above.
web_1  | 
web_1  | npm ERR! A complete log of this run can be found in:
web_1  | npm ERR!     /root/.npm/_logs/2019-11-18T13_02_27_077Z-debug.log