1

I copied this code from the Ethereum website and changed the outdated code that the compiler would not accept. However, previously I had no trouble with this modifier (show in the picture) as it now requires me to make the expression an lvalue.

https://i.stack.imgur.com/rctob.png

5

You're doing an assignment, not a comparison. You need == for the comparison, not =.

require(msg.sender == owner);

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