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I have the following code. However, it has a runtime exception on SetValue . What may cause the error?

var _filter = new Filter(....); // Filter implemented IFilter
ApplyFilter(_view.Name, x => x.Name); 
private void ApplyFilter<T>(T curr, Expression<Func<IFilter, T>> prev) 
    var expr = (MemberExpression)prev.Body;
    var prop = (PropertyInfo)expr.Member;
    if (!EqualityComparer<T>.Default.Equals(curr, (T)_filter[prop.Name]))
        prop.SetValue(_filter, curr, null); // Error
        ..... // do something on _filter
The exception is:
System.ArgumentException was unhandled
  Message=Property set method not found.
  Source=mscorlib
  StackTrace:
       at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
       at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
       at MyApp.ErrorLogPresenter.ApplyFilter[T](T curr, Expression`1 prev) in d:\....cs:line 50
                ignoring the index on an indexing property [] or trying to set a property that only has a getter...
– AK_
                Jun 23, 2014 at 16:38
                "Property set method not found." - sounds pretty clear to me; does this property have a setter? Can we see the property in question?
– Marc Gravell
                Jun 23, 2014 at 16:40
        
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