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Instructions to deploy DashR apps on Heroku do not work

The instructions here: do not seem to lead to a correctly deployed app on Heroku.

For instance,

  • Following instructions and deploying lead to an error that the version/language of the app cannot be detected
  • there is no mention of build packs for R. Is this required? Which one is recommended? I have tried since it seems to be the most popular, but there are errors on deployment:
       Error: Failed to install 'dash' from GitHub:
         (converted from warning) installation of package ‘/tmp/Rtmpd6Qpbf/file30b4784b2bc/dash_0.1.0.tar.gz’ had non-zero exit status
       Execution halted
       ERROR: R 3.4.4 failed while executing "init". Check the log for details.
 !     Push rejected, failed to compile R Console app.
 !     Push failed

The python instructions work fine, but the R deployment instructions are incomplete.