What does it mean?

Error 2 error LNK1120: 1 unresolved externals

Error 1 error LNK2019: unresolved external symbol "public: __thiscall Circle::Circle(class Point,int)" (??0Circle@@QAE@VPoint@@H@Z) referenced in function _main

What does it mean? I can't understand. Please help me.
I would guess you have a header file that declares a constructor for a Circle class that takes a Point and an integer as parameters, but you haven't provided the definition of that constructor anywhere. Thus, when you try to use it the linker can't find the definition.
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