Issue with MFC

[amber knoll]

hello guys, i've got an issue with my MFC app, my homework is to create a car park, which allows me to add in Car objects(Reg.Number, Country, Year,Horsepower) , the issue im facing is that whenever i add the information about Reg.No. and Country - both which are declared as string, throw me an error that i need to input a positive integer? but it still adds the car to the car park, which makes no sense. interesting is that, even if i add a positive integer in the given boxes, it still throws the same error. im just lost ash now, could the problem lie in the properties of the edit control box? i attached a screenshot of what it throws me

[dusty otter]

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@amber knoll

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[stiff tartan]

This looks like C#, this is a C/C++ server

[amber knoll]

It’s C++

[stiff tartan]

Ahk myb