Error!

Error retrieving personID from query string:
System.FormatException: Input string was not in a correct format. at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at System.Int32.Parse(String s) at PeopleSearch.DeptWebpage.Page_Load(Object sender, EventArgs e) in \\aegean\wwwroot\PeopleSearch\People\DeptWebpage.aspx.cs:line 62