Error: Cannot find module

[Benjamin Weiner]

I am trying to run a local server using Node on a Windows 8.1 machine. I can start the server with lightning-server, but there is an error thrown, when I try to view a session with a visualization:

$ uname
MINGW64_NT-6.3
$ pwd
/c/Users/name
$ lightning-server
Lightning started on port: 3000
Error: Cannot find module 'lightning-line' from 'C:\Users\name'
    at C:\Users\name\AppData\Roaming\npm\node_modules\lightning-server\node_modules\browserify\node_modules\resolve\lib\async.js:46:17
    at process (C:\Users\name\AppData\Roaming\npm\node_modules\lightning-server\node_modules\browserify\node_modules\resolve\lib\async.js:173:43)
    at ondir (C:\Users\name\AppData\Roaming\npm\node_modules\lightning-server\node_modules\browserify\node_modules\resolve\lib\async.js:188:17)
    at load (C:\Users\name\AppData\Roaming\npm\node_modules\lightning-server\node_modules\browserify\node_modules\resolve\lib\async.js:69:43)
    at onex (C:\Users\name\AppData\Roaming\npm\node_modules\lightning-server\node_modules\browserify\node_modules\resolve\lib\async.js:92:31)
    at C:\Users\name\AppData\Roaming\npm\node_modules\lightning-server\node_modules\browserify\node_modules\resolve\lib\async.js:22:47
    at FSReqWrap.oncomplete (fs.js:82:15)

It appears that the module call is failing because it's looking in the current working directory rather than my node_modules directory.

If I run lightning-server from my npm folder, no errors are thrown (viz displays as expected).

alias lightning-server='cd $(cygpath $APPDATA/npm) && lightning-server'

Does lightning rely on any Node/NPM configs? I have node and npm on my path, but no environment variables set.

[Matthew Conlen]

hey @bmweiner,

lightning uses browserify under the hood to dynamically compile some modules. it looks like thats where things are breaking down.

browserify gets its path set here based on this config property.

what it should be doing is setting config.root to the directory wherever lighting was installed (in this case C:\Users\name\AppData\Roaming\npm\node_modules\lightning-server.

It looks like something wacky is happening with the paths on windows. i primarily dev on osx and linux, any help finding a solution is appreciated

[Choongjae Lee]

I had similar problem here.
I'm on the Ubuntu 14.04.4 LTS.

> lightning-server
Lightning started on port: 3000
Error: Cannot find module 'lightning-line' from '/home/username'
    at /home/username/.nvm/versions/node/v4.2.3/lib/node_modules/lightning-server/node_modules/browserify/node_modules/resolve/lib/async.js:46:17
    at process (/home/username/.nvm/versions/node/v4.2.3/lib/node_modules/lightning-server/node_modules/browserify/node_modules/resolve/lib/async.js:173:43)
    at ondir (/home/username/.nvm/versions/node/v4.2.3/lib/node_modules/lightning-server/node_modules/browserify/node_modules/resolve/lib/async.js:188:17)
    at load (/home/username/.nvm/versions/node/v4.2.3/lib/node_modules/lightning-server/node_modules/browserify/node_modules/resolve/lib/async.js:69:43)
    at onex (/home/username/.nvm/versions/node/v4.2.3/lib/node_modules/lightning-server/node_modules/browserify/node_modules/resolve/lib/async.js:92:31)
    at /home/username/.nvm/versions/node/v4.2.3/lib/node_modules/lightning-server/node_modules/browserify/node_modules/resolve/lib/async.js:22:47
    at FSReqWrap.oncomplete (fs.js:82:15)

In this case, should I do same wacky trick you said before? @mathisonian

[Matthew Conlen]

Hey @dazebug what version of lightning-server do you have installed?