Expected unqualified id before “.” token

I see the above question(and similar questions) are answered at various places here, here and here, but none of them explains what I am really after.

I also saw a very good explanation of qualified / Un-qualified -id here. Here is my code, I am experimenting with static variables defined in the struct.

#include<iostream>
#include<stdio.h>
#include<string>

using namespace std;
struct  foo {
  static  string name ;
};
string foo::name{"Warrior_Monk"};


int main(){
cout<<"foo::name is "<<foo::name<<endl;

//Chaging the name , and then calling the second name through  a **temp** object which will be created 
foo.name ="Great_Warriror_Monk"; // error:expected unqaulified-id before '.' token

//foo::name ="Great_Warriror_Monk";  // THIS IS  THE FIX
foo temp ; 
cout<<"foo::name is "<<temp.name<<endl;
cout<<"foo::name is "<<foo::name<<endl;
    return 0 ; 
}

Now inside the main(), I unsuccessfully tried to change the static variable name with the command:

foo.name ="Great_Warriror_Monk";

for which GCC gave me the error:

error:expected unqaulified-id before '.' token

I know the fix is:

foo::name ="Great_Warriror_Monk"

But I am more inclined towards understanding the error. The error says that it expected an unqualified-id before the '.' token. From my understanding of unqualified id from here, struct foo well qualifies as an unqualified-id. So does it mean the error is incorrect with its wordings?