question

In the "MD to Computer" create tokens activity you are assigning a reference to the created token to "patient.Equipment". This value is shown in the label as "id:127 instance: Exam Table1/Patient Flow_1".
(id, exam table and patient name will obviously vary for later patients)

If the "Acquire WOW2" activity is set to "Insert in Front of" and the same label name, it will add the acquired location to the label, creating an array of values. This will be displayed as
"Array[2]: {/WOW1, id:127 instance: Exam Table1/Patient Flow_1}" on the patient.

Because the label now holds two values (one of which isn't even a location) the "MD to WOW2" walk activity can't determine the proper destination, which results in a an error message.

As you already figured out, setting the acquire activity to "Assign To" instead, will overwrite the previous value, leaving only the actual destination.

Others ways to fix/circumvent this:

1) As far as I can tell, the reference to the created token is not actually needed, so you could just leave the "Assign To" field in the create token activity empty.

2) You could write "patient.Equipment[1]" in the "MD to WOW2" walk activity, specifically referencing the first value in the array.