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Solidity - SyntaxError - Source File Requires Different Compiler Version


If you try to use a newer version of solidity than the solc version you have you will get the following error:

SyntaxError: Source file requires different compiler version (current compiler is 0.4.25+commit.59dbf8f1.Emscripten.clang - note that nightly builds are considered to be strictly less than the released version
pragma solidity ^0.5.2;

You can upgrade solc and truffle if you want but a quicker fix is to change the pragma as below:

pragma solidity ^0.4.25;

The most important parts to understand about the above are:

  • The Solidity version used matches the compiler is version in the error message.
  • Make sure you precede the version with ^. This tells the solidity compiler that the code is at least that version or higher. This allows you to use version 0.5.0 features yet still use an older solc compiler.