AnchorError occurred. Error Code: InstructionFallbackNotFound. Error Number: 101. Error Message: Fallback functions are not supported

Question

I am trying to call the mintNft function on the front end but it throws an error and I can't fix it

the error is: "Program log: AnchorError occurred. Error Code: InstructionFallbackNotFound. Error Number: 101. Error Message: Fallback functions are not supported."

see http response: rpc response

lib.rs

web.ts:

  const tx = await program.rpc.mintNft(
    mintKey.publicKey,
    "https://arweave.net/y5e5DJsiwH0s_ayfMwYk-SnrZtVZzHLQDSTZ5dNRUHA",
    "NFT Title",
    {
      accounts: {
        mintAuthority: program.provider.wallet.publicKey,
        mint: mintKey.publicKey,
        tokenAccount: NftTokenAccount,
        tokenProgram: TOKEN_PROGRAM_ID,
        metadata: metadataAddress,
        tokenMetadataProgram: TOKEN_METADATA_PROGRAM_ID,
        payer: program.provider.wallet.publicKey,
        systemProgram: SystemProgram.programId,
        rent: anchor.web3.SYSVAR_RENT_PUBKEY,
        masterEdition: masterEdition,
      },
    }
  );
  console.log(tx);
  // console.log("Your transaction signature", tx);

Answer 1

1. update your code to match anchor 0.24.2, It should look like this in Cargo.toml

[dependencies]
anchor-lang = "0.24.2"
mpl-token-metadata = { version="1.2.5", features = [ "no-entrypoint" ] }
anchor-spl = "0.24.2"

2. update package.json

{
    "dependencies": {
        "@project-serum/anchor": "^0.24.2",
        "@solana/spl-token": "^0.2.0"
    },
    "devDependencies": {
        "@types/chai": "^4.3.1",
        "@types/mocha": "^9.1.1",
        "chai": "^4.3.6",
        "mocha": "^10.0.0",
        "ts-mocha": "^10.0.0",
        "typescript": "^4.6.4"
    }
}

1. migrate the code to match anchor 0.24.2 for example (too long to post here) https://github.com/katopz/metaplex-anchor-nft/commit/f54ffaf087858f3997e797133ccc6d7748309c0a

2. and also rpc here https://github.com/katopz/metaplex-anchor-nft/commit/a72929548c8041ac422708c04078b8543e0f8a67

3. If nothing work, try run anchor test my forked here (tested today) https://github.com/katopz/metaplex-anchor-nft

4. For frontend, I think you will need to pass wallet provider to make it work. Should be something like this.

anchor.setProvider(new Client(programId, wallet).provider)