Build failure in openbrush examples

[joshua8321]

I'm trying to build psp34 metadata example from here, and it goes into failure with the following error:

...
Compiling my_psp34_metadata v4.0.0-beta (/tmp/cargo-contract_dCY6la)
Finished release [optimized] target(s) in 56.21s
[2/4] Post processing code
ERROR: Loading of original wasm failed

Caused by:
0: Loading of wasm module at '.../openbrush-contracts/examples/psp34_extensions/metadata/target/ink/wasm32-unknown-unknown/release/my_psp34_metadata.wasm' failed
1: Unknown opcode 192

I ran this command to build the example:
cargo +nightly contract build --release

here is the information of my toolchain:

rustc --version
rustc 1.73.0-nightly

rustup toolchain list
nightly-x86_64-unknown-linux-gnu (default)

[h4nsu]

I'm getting the same error with the current stable toolchain. All other psp34 extenstion examples work, but the metadata one fails with the same "opcode 192" error.

[Artemka374]

Hey! First of all, it should be built with stable toolchain, that's true, second thing - could you try using 1.69 version of stable? Sometimes there appear problems in ink! contracts with versions upper

[h4nsu]

You're right, it works with 1.69 version. You need to add relevant rust-toolchain files to the repo and probably also mention it in the README. Using non-latest stable toolchain is a very unusual practice, it's hard to just guess this solution.

[beach-dev]

@Artemka374
Thanks for the information.
Could you guide me how to go back to version 1.69 and install necessary toolchain please?

[h4nsu]

$ rustup install 1.69
$ rustup component add rust-src --toolchain 1.69
$ rustup target add wasm32-unknown-unknown --toolchain 1.69

$ cargo +1.69 contract build --release

[coreggon11]

This is a problem with cargo contract, not OpenBrush. It is fixed in the latest cargo-contract v4.