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-----> Node.js app detected

-----> Creating runtime environment

   NPM_CONFIG_LOGLEVEL=error
   NODE_ENV=production
   NODE_MODULES_CACHE=true
   NODE_VERBOSE=false

-----> Installing binaries
engines.node (package.json): unspecified
engines.npm (package.json): unspecified (use default)

   Resolving node version 12.x...
   Downloading and installing node 12.16.1...
   Using default npm version: 6.13.4

-----> Installing dependencies
Prebuild detected (node_modules already exists)
Rebuilding any native modules

   > @discordjs/opus@0.1.0 install /tmp/build_cfc96e10cd6bbc622307cff02a145bdd/node_modules/@discordjs/opus
   > node-pre-gyp install --fallback-to-build
   
   sh: 1: node-pre-gyp: Permission denied
   npm ERR! code ELIFECYCLE
   npm ERR! errno 126
   npm ERR! @discordjs/opus@0.1.0 install: `node-pre-gyp install --fallback-to-build`
   npm ERR! Exit status 126
   npm ERR! 
   npm ERR! Failed at the @discordjs/opus@0.1.0 install script.
   npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
   
   npm ERR! A complete log of this run can be found in:
   npm ERR!     /tmp/npmcache.Plnq6/_logs/2020-03-16T08_21_02_084Z-debug.log

-----> Build failed

   We're sorry this build is failing! You can troubleshoot common issues here:
   https://devcenter.heroku.com/articles/troubleshooting-node-deploys
   
   Some possible problems:
   
   - node_modules checked into source control
     https://blog.heroku.com/node-habits-2016#9-only-git-the-important-bits
   
   - Node version not specified in package.json
     https://devcenter.heroku.com/articles/nodejs-support#specifying-a-node-js-version
   
   Love,
   Heroku

! Push rejected, failed to compile Node.js app.
! Push failed