This example returns syntax errors when the emit keyword is used.

emit AuctionEnded(highestBidder, highestBid);

This is the doc where the example code is.


Why are there syntax errors? How do you really call an event in pragma solidity ^0.4.21;


2 Answers 2


You also need the correct version of the compiler. pragma solidity ^0.4.21 is only a hint, but not the selection of the concrete compiler.

If you try this at https://remix.ethereum.org/ which loads the 0.4.21 compiler by default, it will work perfectly fine. When you switch the compiler to a lower version (settings tab), you'll get the syntax error.

  • 1
    I see, the version was the key thanks! (note etherium.org not com)
    – jlansey
    Mar 7, 2018 at 20:38
  • oh.. my fault.. thanks for the pointer, changed it to org.
    – ivicaa
    Mar 7, 2018 at 20:40

update truffle

npm install [email protected] -g

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