I used code from one of the tutorials to filter lookups with a picklist on one of my forms and it works great.  The problem I am having is that I did the same on another form and it works properly once then I get the following error:

Error details:
Error occured while executing on user input script.
unknown Task : Task personality is 1300
Error occured

On the form that doesnt work the field that is to be updated based on the values of another is a multi value with checkboxes, on the form that works properly it is a single value with drop down.  Is there something that needs to be added to the code when using a multivalue with checkboxes? The following is the code I used, modified the fields of course.

if (count(Team_Member[Module == input.Module])  ==  0)
 {
 clear Assign_To;
 }
 else
 {
 for each r in Team_Member [Module == input.Module]
 {
 Assign_To:ui.add(r.Name);
 }
 }