Cannot convert 'char*(*)[6]' to 'char***' for argument '2' to 'void prac(int*,char***)'

I see this error when compile my program:

Cannot convert 'char*(*)[6]' to 'char***' for argument '2' to 'void prac(int*,char***)'

How can I fix the code ? Please help me.

Code:

#include <iostream>
using namespace std;

void prac(int *argc, char **b[])
{
//body
//
}

int main()
{

     char *ptr_array[] = {"ssl","0.0.0.0","","tcp","0.0.0.0","8080"};
prac(&argc, &ptr_array);   

    return 0;
}