Solidity 和 truffle 的编译器问题

Question

So I'm trying to learn to build NF token, and I cloned a repo. It's supposed to work with truffle. The thing is I have an error with the compiler, and I don't really understand. Indeed what I know is that the solidity compiler have problems with different versions, hence working with truffle CLI that works better with different versions projects.

So I tried to change to "pragma solidity >0.5.8 <0.6.0;", I did sudo truffle compile, and still have the error.

The error message I got is:

my typo `Source file requires different compiler version (current compiler is 0.7.4+commit.3f05b770.Emscripten.clang) - note that nightly builds are considered to be strictly less than the released version

I know that I need to find a good version of solidity and truffle, but I believe that my versions are okay:

Truffle v5.0.5 (core: 5.0.5) Solidity v0.5.0 (solc-js) Node v14.16.0

Answer 1

Change the compiler version in the truffle-config.js file to match the one your are using in your smart contract

Answer 2

Sometimes even after changing the compiler version in truffle config the error does not go away so instead of using the specific version like ^0.6.0 use >0.6.0