Rhasspy venv install yarn error

Installing Yarn!
> Downloading tarball...

[1/2]: https://yarnpkg.com/latest.tar.gz --> /tmp/yarn.tar.gz.AbW5E9zftl
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100    93  100    93    0     0    438      0 --:--:-- --:--:-- --:--:--   438
100   609    0   609    0     0    743      0 --:--:-- --:--:-- --:--:--  594k
100 1145k  100 1145k    0     0   527k      0  0:00:02  0:00:02 --:--:-- 3189k

[2/2]: https://yarnpkg.com/latest.tar.gz.asc --> /tmp/yarn.tar.gz.AbW5E9zftl.asc
100    97  100    97    0     0   1674      0 --:--:-- --:--:-- --:--:--  1674
100   613    0   613    0     0   2330      0 --:--:-- --:--:-- --:--:--  2330
100   832  100   832    0     0   2020      0 --:--:-- --:--:-- --:--:--  2020
> Verifying integrity...
gpg: key 1646B01B86E50310: public key "Yarn Packaging <yarn@dan.cx>" imported
gpg: Total number processed: 1
gpg:               imported: 1
gpg: Signature made Mon 29 Apr 2019 08:16:55 PM CEST
gpg:                using RSA key 6D98490C6F1ACDDD448E45954F77679369475BAA
gpg: Good signature from "Yarn Packaging <yarn@dan.cx>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: 72EC F46A 56B4 AD39 C907  BBB7 1646 B01B 86E5 0310
     Subkey fingerprint: 6D98 490C 6F1A CDDD 448E  4595 4F77 6793 6947 5BAA
> GPG signature looks good
> Extracting to ~/.yarn...
> Adding to $PATH...
> We've added the following to your /root/.bashrc
> If this isn't the profile of your current shell then please add the following to your correct profile:

export PATH="$HOME/.yarn/bin:$HOME/.config/yarn/global/node_modules/.bin:$PATH"

/root/.yarn/lib/cli.js:45703
  let {
      ^

SyntaxError: Unexpected token {
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Module.require (module.js:353:17)
    at require (internal/module.js:12:17)
    at Object.<anonymous> (/root/.yarn/bin/yarn.js:24:13)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
> Yarn was installed, but doesn't seem to be working :(.