not able to build application

[ephimee]

I just downloaded the source code, but the command stack doesn't exist on Ubuntu.
So I installed it with:
sudo apt-get install haskell-stack
Then I ran the command:
stack build
But then I get:

Downloading lts-16.13 build plan ...RedownloadFailed Request {
  host                 = "raw.githubusercontent.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/fpco/lts-haskell/master//lts-16.13.yaml"
  queryString          = ""
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 "/home/ephimee/.stack/build-plan/lts-16.13.yaml" (Response {responseStatus = Status {statusCode = 404, statusMessage = "Not Found"}, responseVersion = HTTP/1.1, responseHeaders = [("Connection","keep-alive"),("Content-Length","14"),("Content-Type","text/plain; charset=utf-8"),("Content-Security-Policy","default-src 'none'; style-src 'unsafe-inline'; sandbox"),("Strict-Transport-Security","max-age=31536000"),("X-Content-Type-Options","nosniff"),("X-Frame-Options","deny"),("X-XSS-Protection","1; mode=block"),("Via","1.1 varnish (Varnish/6.0)"),("X-GitHub-Request-Id","2F32:D9A2:1FA8CB8:21D391F:5F6C544C"),("Accept-Ranges","bytes"),("Date","Thu, 24 Sep 2020 08:09:49 GMT"),("Via","1.1 varnish"),("X-Served-By","cache-ams21030-AMS"),("X-Cache","MISS, MISS"),("X-Cache-Hits","0, 0"),("X-Timer","S1600934989.270212,VS0,VE153"),("Vary","Authorization,Accept-Encoding"),("Access-Control-Allow-Origin","*"),("X-Fastly-Request-ID","27612b1030939b641a3cc81d368418478b688ab0"),("Expires","Thu, 24 Sep 2020 08:14:49 GMT"),("Source-Age","0")], responseBody = (), responseCookieJar = CJ {expose = []}, responseClose' = ResponseClose})

[prikhi]

Most likely, your ubuntu has an old version of stack:

https://docs.haskellstack.org/en/stable/README/#how-to-install

I just bumped the LTS to 17.2 & confirmed that pulling the LTS's yaml file works fine w/ an up-to-date stack.