error[E0463]: can't find crate for `core` | = note: the `wasm32-unknown-unknown` target may not be installed [NEAR Protocol]

Question

I see this error in the Terminal while building a Rust application (which happens to be about NEAR Protocol, if you're curious):

error[E0463]: can't find crate for core

note: the "wasm32-unknown-unknown" target may not be installed

How can I fix it so that Rust will actually build my NEAR app?

Answer 1

To solve this error, run:

rustup target add wasm32-unknown-unknown

in the terminal, and that should correct the issue.

Note: I'm simply posting here as an answer what the original question asker Dorian Crutcher already wrote within their question. But that suggestion did work for me too.

Answer 2

I had the same problem, its reason is in an out-of-date version of Rust, the solution was to update the Rust to the latest version.