module not found error loading module in MagicMirror

[sdetweil]

the message module not found has nothing to do with MagicMirror ‘modules’ but a library USED by a MagicMirror module. sadly we cannot change or intercept the message

a typical error

Cannot find module ‘request’

In recent mm releases we have removed libraries that are discontinued ( aka deprecated).

many mm modules used these but didn’t document it. so they fail

to fix this you need to install the library in the module folder,
so do

cd ~/MagicMirror/modules

cd modulename (where modulename is the module having the error)

once there, do

ls package.json

if the module does NOT provide that file ( ls reponse is ‘No such file or directory’) then do

npm init -y

NEVER EVER do this in the MagicMirror folder
if you do/did, then do
git checkout package.json

then regardless (in the module folder) do

npm install ???

where ??? is the library noted in the message Cannot find module ‘???’

| in the example message above, ??? is request

to find this message, look in the output of npm start. or if you use pm2 to launch mm do
pm2 logs --lines=50

[MacG]

I don’t find the upgrade of MM quite helpful.

In my case under 2.16 one module (MMM-Fuel) did not work and one of my three calendars could not be loaded with MMM-CalendarExt2. In both cases the certificate error was the reason. The certificate had expired. It was, but there are new ones on the servers.

After upgrading to MM 2.17, MMM-Fuel now works, but not MMM-CalendarExt2 and MMM-OneTracker. So there are more problems than before. I definitely did not expect this with an upgrade. Set both modules to

disabled: true

and I’m rid of the black screen for now.

Now I guess I have to work my way through the post-installation.

Here as example the MMM-CalendarExt2 Error:

[24.10.2021 19:48.03.521] [ERROR] App threw an error during load
[24.10.2021 19:48.03.524] [ERROR] Error: Cannot find module 'request'
Require stack:
- /home/pi/MagicMirror/modules/MMM-CalendarExt2/node_helper.js
- /home/pi/MagicMirror/js/app.js
- /home/pi/MagicMirror/js/electron.js
- /home/pi/MagicMirror/node_modules/electron/dist/resources/default_app.asar/main.js
-
at Module._resolveFilename (internal/modules/cjs/loader.js:887:15)
at Function.n._resolveFilename (electron/js2c/browser_init.js:257:1128)
at Function.Module._resolveFilename (/home/pi/MagicMirror/node_modules/module-alias/index.js:49:29)
at Module._load (internal/modules/cjs/loader.js:732:27)
at Function.f._load (electron/js2c/asar_bundle.js:5:12913)
at Module.require (internal/modules/cjs/loader.js:959:19)
at require (internal/modules/cjs/helpers.js:88:18)
at Object.<anonymous> (/home/pi/MagicMirror/modules/MMM-CalendarExt2/node_helper.js:4:17)
at Module._compile (internal/modules/cjs/loader.js:1078:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1108:10)
[24.10.2021 19:48.03.525] [ERROR] Whoops! There was an uncaught exception...
[24.10.2021 19:48.03.531] [ERROR] Error: Cannot find module 'request'
Require stack:
- /home/pi/MagicMirror/modules/MMM-CalendarExt2/node_helper.js
- /home/pi/MagicMirror/js/app.js
- /home/pi/MagicMirror/js/electron.js
- /home/pi/MagicMirror/node_modules/electron/dist/resources/default_app.asar/main.js
-
at Module._resolveFilename (internal/modules/cjs/loader.js:887:15)
at Function.n._resolveFilename (electron/js2c/browser_init.js:257:1128)
at Function.Module._resolveFilename (/home/pi/MagicMirror/node_modules/module-alias/index.js:49:29)
at Module._load (internal/modules/cjs/loader.js:732:27)
at Function.f._load (electron/js2c/asar_bundle.js:5:12913)
at Module.require (internal/modules/cjs/loader.js:959:19)
at require (internal/modules/cjs/helpers.js:88:18)
at Object.<anonymous> (/home/pi/MagicMirror/modules/MMM-CalendarExt2/node_helper.js:4:17)
at Module._compile (internal/modules/cjs/loader.js:1078:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1108:10) {
code: 'MODULE_NOT_FOUND',
requireStack: [
'/home/pi/MagicMirror/modules/MMM-CalendarExt2/node_helper.js',
'/home/pi/MagicMirror/js/app.js',
'/home/pi/MagicMirror/js/electron.js',
'/home/pi/MagicMirror/node_modules/electron/dist/resources/default_app.asar/main.js',
undefined

Cannot find module ‘request’ means now what? I don’t know what to put in place of the “xxx”.

[sdetweil]

@macg

where xxx is the library noted in the message cannot find module xxx

so your message was

 Cannot find module 'request'

so xxx is

request

just to clarify
there are MORE libraries not found than just request. so I am trying to teach you all how to read the messages and understand what to do…

[MacG]

@sdetweil Thanks, I will use it that way. MMM-OneTracker has the same “request”. Others had this problem with MMM-DWD-WarnWeather - not me. It is strange.

[sdetweil]

@macg no not strange. the authors didn’t know what they were supposed to do with libs they used. and it ‘worked’ by doing nothing.

oops, request has a fatal security bug, and the authors decided the amount of work to fix it wasn’t worth the effort, as new libs are out that don’t have the problem.

so they discontinued it (aka deprecated), mm doesn’t want to drag that security flaw in and took action to move the base code to another lib, and remove the bad one(s)…

oops now we have lots of old, some unmaintained, modules that used the only copy of the lib and didn’t say so. .(as a dependency in their module’s package.json file)…

so nobody knows, and it’s gone. oops…

[sdetweil]

@macg as for the cert error, not the mm code at all

the certificate authority cert expired and electron didn’t handle it. chromium did

but we have to upgrade electron to a version that works, and drag along all the other stuff

libs not found I already explained

welcome to the world of open source

in my career at IBM there was one cardinal rule

never EVER make changes that break existing apps.

same data in produces the same data out, always.
u made a mistake?! oops, somehow have to make a DIFFERENT input to get a different output.
it takes work, and thought and time.
but developers and customers can work on new value instead of costly rework

in the new internet world time is critical, so ship, and fix as fast as u can, breaking changes need to be DOCUMENTED. what a relief THAT is for users and customers…!
and, stuff that can’t keep up will be discarded ‘quickly’…, yeh, sure… hahahaha… customers think that makes their life easier too.

[MacG]

@sdetweil I understand that some authors do not use the current libs. The “strange” referred to the fact that I have no problems with MMM-DWD-WarnWeather, but others have to install the module “request”.

Open source is both a curse and a blessing. Now everything works again and MM’s layout changes to the clock module were also quickly undone. :slightly_smiling_face:

[sdetweil]

@macg said in fix for black screen in 2.16 and later:

The “strange” referred to the fact that I have no problems with MMM-DWD-WarnWeather, but others have to install the module “request”.

did u npm install request in the mm folder, or in a module folder where there was no package.json, the latter ends up putting it in the mm/node_modules, the same as the former

[mumblebaj]

Maybe this can help some users.

The following will search all *.js files in the modules folder for the reference of request. You can then just enter the module folders and install as per @sdetweil suggestion above. The same can be done for the other missing modules.

grep -r -E '('request')' ~/MagicMirror/modules/*/*.js

or search for multiple problem modules

grep -r -E '('request') | ('valid-url')' ~/MagicMirror/modules/*/*.js

Produces the following:

[sdetweil]

@mumblebaj and then pull off the module name and scan it’s package.json to see if it’s referenced