If you are experiencing this issue it is likely that the Kitting List does not have a 'Type' value set against it. Please check that the KITTING_LIST_TYPE Control Flag has a value set against it by doing the following:
Click Options
Click System Maintenance
Click System Settings
Click General System Settings
Click Control File
In the 'Control Item' field enter 'Kitting_List_Type' and press Enter
Enter Modify Mode by pressing CTRL + M
In the 'Value' column, click the drop down and select a value. By Part is the default value
Click Exit
