The 1inch Smart Contract is unable to compile in Remix as it appears to be stuck in the Solidity compiling phase.


  1. Create a new 1inch_38211317.sol smart contract file in Remix.
  2. Compile the contract.
  3. Deploy and run the contract on the Ropsten Test Network.


  1. The 1inch Smart Contract code is copied into a new 1inch_Test.sol file.
  2. The default compiler version throws an error.

browswer/1inch_38211317.sol:782:1: ParseError: 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 pragma solidity ^0.6.0

Compiler error

  1. Change the compiler to the latest local version - 0.7.4

  2. The Compile 1inch_38211317.sol button is stuck in the compiling/loading state.

Compile stuck

1 Answer 1


Bit of an awkward one.

0.7.4 is too high, given some of the contracts are ^0.6.0 (and the ^ prevents using 0.7.x.)

But you'll need at least 0.6.5 due to the use of the immutable keyword in one of the contracts.

So really your choices are >=0.6.5 but < 0.7.0. (I've checked they work.)

( The important point here being that there are multiple contracts in the that one file.)

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