В чём причина ошибки "Нет перегруженного метода, который соответствует делегату"? - C#

foreach (var file in allFiles)
                {
                    myThreads.Add(new Thread(new ParameterizedThreadStart(Calc))); //Ошибка!!!
                    Calc(myLengthList, myNestingList, file);
                }

private static void Calc(List<ElementOfLengthResultList> myLengthList, List<ElementOfNestingResultList> myNestingList, string file)
        {
            SyntaxTree tree = SyntaxTree.ParseFile(file);
            IEnumerable<MethodDeclarationSyntax> methods = tree.GetRoot().DescendantNodes().OfType<MethodDeclarationSyntax>();
 
            foreach (var method in methods)
            {
                if (method.Body != null)
                {
                    BlockSyntax methodBody = method.ChildNodes().OfType<BlockSyntax>().Single();
 
                    IEnumerable<StatementSyntax> bs = methodBody.DescendantNodes().OfType<BlockSyntax>();
 
                    int Length = methodBody.DescendantNodes().OfType<StatementSyntax>().Except(bs).Count();
                    int nestingLevel = new NestingLevelVisitor().Visit(method);
                    string nameOfFile = Path.GetFileName(file);
                    int number = tree.GetLineSpan(method.Identifier.Span, false).StartLinePosition.Line + 1;
 
                    ElementOfLengthResultList elementLength = new ElementOfLengthResultList(Length, nameOfFile, number);
                    ElementOfNestingResultList elementNesting = new ElementOfNestingResultList(nestingLevel, nameOfFile, number);
                    myLengthList.Add(elementLength);
                    myNestingList.Add(elementNesting);
                }
            }
        }

Thread th = new Thread(delegate() { Calc(myLengthList, myNestingList, file); });