Error when running yarn build

[Leurus]

Getting this error when running yarn build, even on a fresh download. Tried upgrading yarn and clearing cache to no avail.

[Pauan]

Hmmm, I can't reproduce this, a fresh installation works fine for me.

What are all of the commands that you used?

What version is your yarn? Judging by the screenshot, it's quite old.

[Leurus]

This is the version I get, and the error I get when I try to update. Thought I already updated also but now it's not letting me.

The commands I used in order are:

rustup install nightly rustup override set nightly yarn yarn build

No issues until I tried to do yarn build

[Pauan]

How did you install yarn?

[Leurus]

I used the guide you posted to install it. It's been a long time. I haven't changed anything since it was last working a few months ago.

[Pauan]

There are two ways to install yarn: using npm install --global yarn, or installing a binary file. Which did you use?

[Leurus]

I used npm install --global yarn - also just tried that again to upgrade and I'm getting the same error when trying yarn build.

[Pauan]

Okay, in that case you have to use npm update --global yarn in order to upgrade your yarn. After that your yarn --version should show 1.22.10

Also, what does your node --version show? You probably need to update your Node.js as well, since Rollup requires a fairly recent version of Node.js.

[Leurus]

My node version is 8.11.1 but I can't upgrade because the download I get from that site requires Windows 8 or 10, whereas I have 7.

[Pauan]

That's definitely too old. You can try installing from here.

[Leurus]

That's fixed it. Thanks!