truffle compile shows error TypeError Invalid type for argument in function call

Question

When run truffle compile, I get the error:

Compiling ./contracts/Migrations.sol...

/home/edureka/t/contracts/Migrations.sol:16:32: TypeError: Type int256 is not implicitly convertible to expected type uint256.
    last_completed_migration = completed;
                               ^-------^
,/home/edureka/t/contracts/Migrations.sol:21:27: TypeError: Invalid type for argument in function call. Invalid implicit conversion from uint256 to int256 requested.
    upgraded.setCompleted(last_completed_migration);
                          ^----------------------^

How to solve this?

Answer 1

You are getting this error because you have mentioned a wrong datatype. The generally used datatype is uint. So change the code

function setCompleted(uint completed)