Transfering Lists between winform

Transfering Lists between winform

Normally i use something like
public List<Item> itemList = new List<Item>();
public Total(List<Item> i)
{
itemList = i;
InitializeComponent();
}
but now im getting
Error 1 Inconsistent accessibility: parameter type
'System.Collections.Generic.List<Budgeting_Program.Item>' is less
accessible than method
'Budgeting_Program.Total.Total(System.Collections.Generic.List<Budgeting_Program.Item>)'
C:\Users\Mika\Documents\Visual Studio 2012\Projects\Budgeting
Program\Budgeting Program\Total.cs 22 16 Budgeting Program
I'm not quite sure what this means. Can anyone help please!