Building error with latest version from github

[dmitriy-serdyuk]

I'm trying to build the latest version of the code (pypi package works fine) and getting the following error:

$ npm run build

> [email protected] build /Volumes/data/projects/pastalog
> webpack

[BABEL] Note: The code generator has deoptimised the styling of "/Volumes/data/projects/pastalog/node_modules/immutable/dist/immutable.js" as it exceeds the max of "100KB".
Hash: a50dc1dbe900ea6bcb4d244164e0fcd2efaf88086482cdaa7e742230415b
Version: webpack 2.1.0-beta.13
Child
    Hash: a50dc1dbe900ea6bcb4d
    Version: webpack 2.1.0-beta.13
    Time: 17305ms
                    Asset     Size  Chunks             Chunk Names
    ./build/assets/app.js  1.23 MB       0  [emitted]  main
        + 373 hidden modules

    ERROR in ./~/css-loader!./~/sass-loader!./src/styles.scss
    Module build failed:
        @extend .h3;
       ^
          ".gridMark" failed to @extend ".h3".
    The selector ".h3" was not found.
    Use "@extend .h3 !optional" if the extend should be able to fail.
          in /Volumes/data/projects/pastalog/src/styles.scss (line 131, column 5)
     @ ./src/styles.scss 4:14-117
Child
    Hash: 244164e0fcd2efaf8808
    Version: webpack 2.1.0-beta.13
    Time: 17296ms
                Asset    Size  Chunks             Chunk Names
    ./build/server.js  864 kB       0  [emitted]  main
        + 313 hidden modules
Child
    Hash: 6482cdaa7e742230415b
    Version: webpack 2.1.0-beta.13
    Time: 17357ms
                    Asset    Size  Chunks             Chunk Names
    ./test/build/index.js  135 kB       0  [emitted]  main
        + 121 hidden modules

npm ERR! Darwin 15.2.0
npm ERR! argv "/usr/local/Cellar/node/6.2.0/bin/node" "/usr/local/bin/npm" "run" "build"
npm ERR! node v6.2.0
npm ERR! npm  v3.8.9
npm ERR! code ELIFECYCLE
npm ERR! [email protected] build: `webpack`
npm ERR! Exit status 2
npm ERR!
npm ERR! Failed at the [email protected] build script 'webpack'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the pastalog package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     webpack
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs pastalog
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls pastalog
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /Volumes/data/projects/pastalog/npm-debug.log

After some time investigating, I discovered that this line causes the problem, the build runs fine if I delete it. What does this line do? What is the proper fix for this problem?

[bnsh]

I'm having this same problem. Is there any resolution? (Aside from deleting that line?)

[tastyminerals]

Same problem here :(