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Build Error because of a Member Function

CombatJ (12)
Good Day! My C++ project seems to have an error when it builds and I kindly ask for help. My program basically multiplies and adds either positive or negative really large integers.
My program seems okay to me but it doesn't build.
I think it is due to my equalizeLength(); function but I'm not really sure.

The dev C++ compiler tells me:
line 77 VVLIver1.cpp: default argument given for parameter 3 of 'void VVLI::equalizeLength(std::string&, std::string&, char)'
line 28 VVLIver1.h: after previous specification in 'void VVLI::equalizeLength(std::string&, std::string&, char)'
[Build Error] [VVLIver1.o] Error 1

VVLIver1.h File
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#ifndef VeryLINT_H
#define VeryLINT_H 1
#include <iostream>
#include <string>
#include <stack>

using namespace std;

class VVLI
{
      private:
              
             string num;    
      public:                       

             VVLI(string s);
             VVLI();
             
             void negativeop(string num1, string num2);
             void deleteneg(string& num);
             void deleteLeadingZeros(string& num);
             void equalizeLength(string& num1 , string& num2, char pad = '0');
             string addLargeNumbers(string num1, string num2);
             string subtractLargeNumbers(string num1, string num2);
             void addOp(string num1, string num2);
             string multiplyLargeNumbers(string num1, string num2);
             void multiplyOp(string num1, string num2);
             
             friend istream& operator >>(istream& in, VVLI& INT);
             friend ostream& operator <<(ostream& out, VVLI& INT);
             VVLI operator + (VVLI& INT);
             VVLI operator * (VVLI& INT);
};


#endif



VVLIver1.cpp File Just a Snippet. Not the full code.
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#include <iostream>
#include <string>
#include <stack>
#include <cstdlib>
#include "VVLIver1.h"

using namespace std;



void VVLI::equalizeLength(string& num1 , string& num2, char pad = '0')
{

	if(num1.size() < num2.size()){
		unsigned int diff = num2.size() - num1.size();
		string temp;
		while(diff--) //add starting zeros
			temp += pad;
		temp += num1;
		num1 = temp;
	}
	else if(num2.size() < num1.size()){
		unsigned int diff = num1.size() - num2.size();
		string temp;
		while(diff--) //add starting zeros
			temp += pad;
		temp += num2;
		num2 = temp;
	}
}






VVLI VVLI::operator +(VVLI& INT)
{
     equalizeLength(num,INT.num);
    
     short numb1 = (num[0] - '0'), numb2 = (INT.num[0] - '0');
     string num1 = addLargeNumbers(num,INT.num);
     string num2 = subtractLargeNumbers(num,INT.num);
     
     if( negfuncnum1 == true && negfuncnum2 == true)
     {
         //cout << "-" << addLargeNumbers(num1, num2) << endl;
         num1.insert(0, "-"); VVLI a(num1); return a;
     }
     if( numb1 >= numb2 && negfuncnum1 != true && negfuncnum2 == true)
     {
         //cout << subtractLargeNumbers(num1, num2) << endl;
         VVLI b(num2); return b;
     }
     if( numb1 >= numb2 && negfuncnum1 == true && negfuncnum2 != true)
     {
         //cout << "-" << subtractLargeNumbers(num1, num2) << endl;
         num2.insert(0, "-"); VVLI b(num2); return b;
     }
     if( negfuncnum1 != true && negfuncnum2 != true)
     {
         //cout << addLargeNumbers(num1, num2) << endl;
         VVLI a(num1); return a;
     }
     
     
     if( numb1 <= numb2 && negfuncnum1 != true && negfuncnum2 == true)
     {
         //cout << "-" << subtractLargeNumbers(num1, num2) << endl;
         num2.insert(0, "-"); VVLI b(num2); return b;
     }
     if( numb1 <= numb2 && negfuncnum1 == true && negfuncnum2 != true)
     {
         //cout << subtractLargeNumbers(num1, num2) << endl;
         VVLI b(num2); return b;
     }
       

}


Thank you!!! I hope that someone may enlighten me. It would be really nice if someone can explain why my program doesn't work.
moorecm (1932)
On line 11 of VVLIver1.cpp, just remove the default value part (= '0'). I haven't really taken a close look but that's what the compiler error message is about.
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