Ambiguity with Action and Func parameter

Question

How is it possible that this code

TaskManager.RunSynchronously(fileMananager.BackupItems, package);

causes a compile error

Answer 1

I came across the same problem, the solution was:

var r = RunSynchronously(x =>
{
    return true;
}, true);

RunSynchronously(x =>
{
}, true);

Now, why the compiler cannot do that???