Repeat the previous Roughing operation as summarised below, but with slight changes (marked '*'):
In the Operations toolbar click Roughing.
Select the whole solid. Select no boundaries.
In
the General tab, set Rest
Rough to checked *, set
Offset to 0.2,
set Digitise Stock to unchecked
* (you can leave the other settings as they are).

In the Tooling tab select the tool 6 mm Endmill - long series* from the ToolStore (you can leave the other settings as they are).
In the Depth tab set Clearance to 5, Level to 0, Depth to 0 and Cut Increment to 2. Click OK to close the dialog and generate the operation (there will be no prompt for stock).