Task Reports displaying Multiple Assignees

 I have built a Task Report following the Task Report Tutorial.  I have some tasks with multiple assignees, and those are showing in the report.  But the report only shows the User Id or Group Id - eg VI1234 or [Group: 1234].

 
Task Name
Customer Name
Start Date
Due Date
Assignee
Status

Bye

11/04/17 11:47

 

[Group:2920]; [Group:2916]

 

Bye

11/04/17 11:23

 

[Group:2920]

 

Emsley

10/04/17 13:32

11/04/17 13:32

VI1234

Overdue

Emsley-Alpha

11/04/17 08:33

 

AB9876

 

I need to be able to convert these to a name suitable for display.  I already have a rule which will convert a single User or Group to a display name, and a wrapper for this that will deal with arrays of User or Group, eg converts VI1234 to 'Paul Emsley' and converts [Group: 1234] to 'Admin Team - Payments'

I have tried several ways to get this to work, but always end up with a message saying that a grid component has an invalid value for “totalCount”. “totalCount” must not be null or less than the number of items in any of the “data” arrays, but “totalCount” was 4 and the largest column data array had 5 items.  This is because I have 4 tasks, but one of them has two assignees, giving 5 assignees in total.

Can anybody tell me how to get the assignee column to show display names when there may be more than one assignee per task?

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