Map won't accept wxSize and String variant | WxWidgets | C++

I've used variant in this same format before except with a simpler map so I don't know why It gives me an error when I put a wxSize object instead of String in any of the map values it gives me an error

I want to add a map in all the vectors with a key of "SIZE" and a value of a wxSize variable

Gives me no instance of constructor error:

wxSize PlusImageSize = wxSize(30, 30);

std::unordered_map < wxStaticBitmap*, std::vector< std::unordered_map < std::string, std::variant<std::string, wxSize> >>> EditoryMenuBtnCategoryIndex1{

            {RightAddBtn, { {"TYPE","PNG"}, {"ACTIVE","WhitePlus.png"}, {"INACTIVE","GreyPlus.png"} , {"SIZE", PlusImageSize }    }},
            {RightSearchBtn, { {"TYPE","PNG"}, {"ACTIVE","WhiteSearch.svg"}, {"INACTIVE","GreySearch.svg"}                 }},
            {RightEditBtn , { {"TYPE","PNG"}, {"ACTIVE","WhiteEdit.svg"}, {"INACTIVE","GreyEdit.svg"}                      }},
            {RightFilterBtn, { {"TYPE","PNG"}, {"ACTIVE","WhiteFilter.png"}, {"INACTIVE","GreyFilter.png"}                 }}
        };

Works fine:

std::unordered_map < wxStaticBitmap*, std::vector< std::unordered_map < std::string, std::variant<std::string, wxSize> >>> EditoryMenuBtnCategoryIndex1{

            {RightAddBtn, { {"TYPE","PNG"}, {"ACTIVE","WhitePlus.png"}, {"INACTIVE","GreyPlus.png"} , {"SIZE", "dwekjf"}    }},
            {RightSearchBtn, { {"TYPE","PNG"}, {"ACTIVE","WhiteSearch.svg"}, {"INACTIVE","GreySearch.svg"}                 }},
            {RightEditBtn , { {"TYPE","PNG"}, {"ACTIVE","WhiteEdit.svg"}, {"INACTIVE","GreyEdit.svg"}                      }},
            {RightFilterBtn, { {"TYPE","PNG"}, {"ACTIVE","WhiteFilter.png"}, {"INACTIVE","GreyFilter.png"}                 }}
        };

Error code