Node.js - Problemas al ejecutar web en node.js

Estimado amigos por favor ayúdenme tengo el siguiente problema cuando ejecuto con: npm start me sale los siguientes errores:
F:\Proyecto\elearn\node_modules\mongoose\lib\model.js:440
if (this.$__.saving) {
^
TypeError: Cannot read property '$__' of undefined
at Model.save (F:\Proyecto\elearn\node_modules\mongoose\lib\model.js:440:12)
at F:F:\Proyecto\elearn\node_modules\async\dist\async.js:3880:24
at eachOfArrayLike (F:\Proyecto\elearn\node_modules\async\dist\async.js:1069:9)


Este es el debug log
-------------------------------------------------------
0 info it worked if it ends with ok
1 verbose cli [ 'C:\\Program Files\\nodejs\\node.exe',
1 verbose cli 'C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js',
1 verbose cli 'start' ]
2 info using [email protected]
3 info using [email protected]
4 verbose run-script [ 'prestart', 'start', 'poststart' ]
5 info lifecycle [email protected]~prestart: [email protected]
6 info lifecycle [email protected]~start: [email protected]
7 verbose lifecycle [email protected]~start: unsafe-perm in lifecycle true
8 verbose lifecycle [email protected]~start: PATH: C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin;F:\Proy_h9\elearn\node_modules\.bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\nodejs\;C:\Program Files\Git\cmd;C:\Users\Administrador\AppData\Roaming\npm;f:\Users\Administrador\AppData\Local\Programs\Microsoft VS Code\bin
9 verbose lifecycle [email protected]~start: CWD: F:\Proy_h9\elearn
10 silly lifecycle [email protected]~start: Args: [ '/d /s /c', 'node ./bin/www' ]
11 silly lifecycle [email protected]~start: Returned: code: 1 signal: null
12 info lifecycle [email protected]~start: Failed to exec start script
13 verbose stack Error: [email protected] start: `node ./bin/www`
13 verbose stack Exit status 1
13 verbose stack at EventEmitter.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\index.js:301:16)
13 verbose stack at EventEmitter.emit (events.js:182:13)
13 verbose stack at ChildProcess.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
13 verbose stack at ChildProcess.emit (events.js:182:13)
13 verbose stack at maybeClose (internal/child_process.js:962:16)
13 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:251:5)
14 verbose pkgid [email protected]
15 verbose cwd F:\Proy_h9\elearn
16 verbose Windows_NT 6.3.9600
17 verbose argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "start"
18 verbose node v10.15.0
19 verbose npm v6.4.1
20 error code ELIFECYCLE
21 error errno 1
22 error [email protected] start: `node ./bin/www`
22 error Exit status 1
23 error Failed at the [email protected] start script.
23 error This is probably not a problem with npm. There is likely additional logging output above.
24 verbose exit [ 1, true ]