Error using SumOperator with Optimization Variables

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I have an Optimization Problem where I created the optim. variable x and the optim. problem linoptim.
Now I am trying to define my constraints and I keep getting an Error
nTasks = 3;
nRess = 2;
maxPT = 50;
x = optimvar('x',nTasks,nRess,maxPT,'Type', 'integer','LowerBound',0,'UpperBound',1);
Constraint1 = sum(x,[2 3]) == ones(nTasks, 1);
"Error in using optim.internal.problemdef.SumOperator
Dimension argument must be a positive integer scalar within indexing range.
If I write the same command and instead of x am using a matrix it works just fine:
sum(rand ([3 2 50]), [2 3])

Accepted Answer

Torsten
Torsten on 14 Aug 2022
nTasks = 3;
nRess = 2;
maxPT = 50;
x = optimvar('x',nTasks,nRess,maxPT,'Type', 'integer','LowerBound',0,'UpperBound',1);
Constraint1 = sum(sum(x,2),3) == ones(nTasks,1);

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