`generate_cpi_crate` proc macro panicked

[ClaudeZsb]

Just a newbie to rust and solana.

I'm finding ways to let my program interact with other programs. While there is interface in solidity and you only need to know the address that you wanna call and apply the appropriate interface to that address, I may need IDL to do the similar thing in solana.

I've read the guide of anchor for cross program invocation. Just really don't like it. It means you have to clone other program's source code into your project. Then I found IDL to work like an interface that could solve the problem of source code. And then I found this tool for generating rust code from the IDL json file. So I'm trying to split the examples in anchor guide puppet and puppet-master into two seperate repos. And I'm trying to use anchor-gen within puppet-master repo in order to invoke puppet. But I ran into this error

puppet within puppet-master repo

anchor_gen::generate_cpi_crate!("idl.json");

declare_id!("9ceHBqVGkYRNJ2uRZG3xvbuU4BQbRKESSs8Q3sWQ74Z9");

what i'm using

[dependencies]
anchor-gen = "0.3.1"
anchor-lang = "0.30.1"

puppet idl json

{
  "address": "9ceHBqVGkYRNJ2uRZG3xvbuU4BQbRKESSs8Q3sWQ74Z9",
  "metadata": {
    "name": "hello_anchor",
    "version": "0.1.0",
    "spec": "0.1.0",
    "description": "Created with Anchor"
  },
  "instructions": [
    {
      "name": "initialize",
      "discriminator": [
        175,
        175,
        109,
        31,
        13,
        152,
        155,
        237
      ],
      "accounts": [
        {
          "name": "new_account",
          "writable": true,
          "signer": true
        },
        {
          "name": "signer",
          "writable": true,
          "signer": true
        },
        {
          "name": "system_program",
          "address": "11111111111111111111111111111111"
        }
      ],
      "args": [
        {
          "name": "data",
          "type": "u64"
        }
      ]
    },
    {
      "name": "set",
      "discriminator": [
        198,
        51,
        53,
        241,
        116,
        29,
        126,
        194
      ],
      "accounts": [
        {
          "name": "new_account",
          "writable": true
        }
      ],
      "args": [
        {
          "name": "data",
          "type": "u64"
        }
      ]
    },
    {
      "name": "sol_transfer",
      "discriminator": [
        135,
        254,
        247,
        202,
        217,
        48,
        184,
        165
      ],
      "accounts": [
        {
          "name": "from",
          "writable": true,
          "signer": true
        },
        {
          "name": "to",
          "writable": true
        },
        {
          "name": "system_program",
          "address": "11111111111111111111111111111111"
        }
      ],
      "args": [
        {
          "name": "lamport",
          "type": "u64"
        }
      ]
    }
  ],
  "accounts": [
    {
      "name": "NewAccount",
      "discriminator": [
        176,
        95,
        4,
        118,
        91,
        177,
        125,
        232
      ]
    }
  ],
  "types": [
    {
      "name": "NewAccount",
      "type": {
        "kind": "struct",
        "fields": [
          {
            "name": "data",
            "type": "u64"
          }
        ]
      }
    }
  ]
}