problem with a summation object

[Maria]

Dear everyone,

I tried to use a summation object to give feedback to experimental
subjects about their accuracy and reaction times.
I used following code:
Dim SummationAccA, SummationAccB, SummationRTA, SummationRTB as
Summation
(global variables)

Set SummationAccA = New Summation
Set SummationRTA = New Summation
Set SummationAccB = New Summation
Set SummationRTB = New Summation
(before running the list)

SummationAccA.AddObservation ReactionInterval.ACC
SummationRTA.AddObservation ReactionInterval.RT
SummationAccB.AddObservation ReactionInterval2.ACC
SummationRTB.AddObservation ReactionInterval2.RT
(ReactionInterval & Reactioninterval2 are slide objects)

By attempting to add the accuracies and reaction times following error
occurs:
"Object does not have a default value"

I used the same principle in further experiments and there it worked.
I hope there is just a simple mistake, thanks for answers,
best regards,
Max

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