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I saw an example about this, while was searching it on the internet.

I want to deploy a new contract which is ProjectContract. However, I could not get contract address as below. I think this is for old version.

address newProjectAddress = new ProjectContract(name, description, requiredPrice, msg.sender);

And the error message is: This the error message

How can I do that for the new versions?

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As the message says, the you cant convert a contract to address implicitly. You can, however, convert the them explicitly.

address newProjectAddress = address(new ProjectContract(...));

The type returned by new ProjectContract(...) is ProjectContract and not address.

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