使用Truffle时遇到的问题和解决方法

问题1 错误信息 Error: CompileError: /C/Users/media/ethereum_work/course3/contracts/Ballot.sol:1:1: ParserError: Source file requires different compiler version (current compiler is 0.5.12+commit.7709ece9.Emscripten.clang – note that nightly builds are considered to be strictly less than the released versi