truffle compile outputs Warning: Invoking events without "emit" prefix is deprecated.
Compilation warnings encountered:
Invoking events without "emit" prefix is deprecated.
Transfer(msg.sender, _to, _value);
As the warning mentions, add emit as a prefix like this:
emit Transfer(msg.sender, _to, _value);
The emit keyword is used to call the events explicitly.
Try removing zeppelin-solidity and reinstalling version zeppelin-solidity 1.8.0
npm install --save email@example.com
This should help
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