Had a difficult error message that I was struggling with for a while in Visual Studio. This is a small C# taster example line:

Console.WriteLine("At a height of {1}m and a weight of {2}kg, {3} has a BMI of {4}\n", p1.Height, p1.Weight, p1.Name, p1.ComputeBMI(p1.Height,p1.Weight));

And the error message:

"Index (zero based) must be greater than or equal to zero and less than the size of the argument list." Wasnt sure what to make of the index, but I had a suspicion it had to do with arrays. Turns at the issue was quite simple. In console.writeline, the assumption is that the arguments start numbering from {0} to {n-1} where there are n arguments. I was starting from 1, thus causing this issue.