error[E0463]: can't find crate for `core` | = note: the `wasm32-unknown-unknown` target may not be installed = help: consider downloading the target with `rustup target add wasm32-unknown-unknown` = help: consider building the standard library from source with `cargo build -Zbuild-std`

Received a internal compiler error OR an unknown message type, view this in debug mode to view the payload

{ "rendered": "For more information about this error, try `rustc --explain E0463`.\n", "$message_type": "diagnostic", "children": [], "code": null, "level": "failure-note", "message": "For more information about this error, try `rustc --explain E0463`.", "spans": [] }