fix for black screen in 2.16 and later

kusselin

@sdetweil Hello everyone, I haven’t been here for a while and my Magic Mirror was switched off…after I switched it on again I made updates to the modules via remote…but I still don’t have any display for some modules like Tankerkönig…when I start the Mirror it always says “Modules cannot be loaded”.

Now, as described by sdetweil, there are commands that you have to execute in the modules in question…but unfortunately I haven’t quite understood how I have to do this in the right order?

It would be really nice if you could explain to me how I have to proceed in order to display the modules again, such as Tankerkönig or mmm-fuel.

Thank you very much in advance for your help.

Greetings

Kussel

i don´t understand that here:

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

how do I proceed exactly?

pi@raspberrypi:~/MagicMirror/modules/MMM-Tankerkoenig $ npm init -y
Wrote to /home/pi/MagicMirror/modules/MMM-Tankerkoenig/package.json:

{
  "name": "MMM-Tankerkoenig",
  "version": "1.0.0",
  "description": "This is a module for the [MagicMirror²](https://github.com/MichMich/MagicMirror/) which displays a fuel prices from [Tankerkoenig](https://www.tankerkoenig.de/).",
  "main": "MMM-Tankerkoenig.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/terenc3/MMM-Tankerkoenig.git"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/terenc3/MMM-Tankerkoenig/issues"
  },
  "homepage": "https://github.com/terenc3/MMM-Tankerkoenig#readme"

sdetweil

@kusselin find the messages output by mm

search the messages for one like shown (without the ???)

find the name of the library in quotes (now u have ???)

issue a command using that info

kusselin

@sdetweil thank you…it´s working now.

LMAC

I ran the command as recommended (request was my error as well). I now have this error and MM will not load:

A JavaScript error occurred in the main process
Uncaught Exception:
Error: Cannot find module ‘logger’
Require stack:

/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 (node:internal/modules/cjs/loader:940:15)
at Function.n._resolveFilename (node:electron/js2c/browser_init:249:1128)
at Function.Module._resolveFilename (/home/pi/MagicMirror/node_modules/module-alias/index.js:49:29)
at Module._load (node:internal/modules/cjs/loader:785:27)
at Function.c._load (node:electron/js2c/asar_bundle:5:13331)
at Module.require (node:internal/modules/cjs/loader:1012:19)
at require (node:internal/modules/cjs/helpers:94:18)
at Object. (/home/pi/MagicMirror/js/app.js:13:13)
at Module._compile (node:internal/modules/cjs/loader:1116:14)
at Object.Module._extensions…js (node:internal/modules/cjs/loader:1169:10)

sdetweil

@lmac well you ran it in the wrong place… oops

do this

cd ~/MagicMirror
rm -rf node_modules
rm package-lock.json
npm install

then for whatever module was causing problem

cd ~/MagicMirror/modules/modulename

do the same last 3 steps as above
AND THEN

npm install request --save

DarrenHill

Just wanted to say thanks for the fix here.

Did an update and hit exactly this with MMM-GmailFeed and the request module.

Installed it back (with an audit fix afterwards) and now all up and running again :)

sdetweil

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

with an audit fix afterwards

don’t do those… many times leave more trouble than they fix…
we can’t suppress the audit warning message

DarrenHill

@sdetweil OK, thanks for the pointer.

Always kinda worried when that style of message pops up, for security and suchlike.

I see from the update that my node is very much out of date, so now just backing things up before setting the update script onto it to try and bring that up too.

sdetweil

@darrenhill upgrade is for MM, not node, (altho it might do it, works sometimes, need to move to n) …

easiest is using the node version of nvm, called n

do

sudo npm i n -g
PATH="$PATH"
n 16

then node 16 will be installed…

note that you will have to do another npm install in the mm (and maybe module folders)
this the upgrade would do (with force instead of apply)

n also allows you to SWITCH versions, or use a particular version for ONE app…
see n --help

DarrenHill

@sdetweil - I did it via your update script, and it has updated Node from v10.x to v16.x (or at least that is what appears to have happened from what I could read).

It’s quite an old install that just sits on my desk and largely gets left to its own devices. It is in a PiTop Ceed rather than a true mirror, and basically the only thing it runs is MM (it’s actually a dual-boot via PINN also with RetroPie, but the Raspi OS partition is essentially only MM). So no need to keep things focussed to one app or anything like that - no issue of cross-contamination.

All is working fine after the update though, so no problems.