Method problem

Question

thisis the error Iam getting
Compiler Error Message: CS1502: The best overloaded method match for 'BPOCompSalesListings.SaveSale1(ref string)' has some invalid arguments

Source Error:

Line 117:string Source; Line 118: Line 119:if (!SaveSale1(Result)) Line 120:{ Line 121:Source = "Save Sale 1: ";

Source File: d:\Websites\TitaniumValuations\BPOCompSalesListings.aspx.cs   Line: 119

here is a code snippet

string Result;
string Source;
if (!SaveSale1(Result))
{
Source = "Save Sale 1: ";
DisplayError(Source, Result);
}