How to Fix the Issue of Revit Arrays Requiring a Minimum of Two Items

How to Resolve the Issue of Revit Arrays Not Allowing Quantities Less Than 2

When using the Revit array command to duplicate a component group, you can control the number of copies through a quantity parameter. However, Revit does not allow the array quantity to be less than 2. Setting the quantity to 1 essentially means copying the original component only, which the software cannot interpret properly and will trigger an “invalid parameter value” error. So, how can this issue be fixed?

The solution is to create an array with two components and then use a visibility parameter to control their display. When only one component should be visible, the other is hidden. When the quantity is two or more, the entire array is shown as intended.

Here’s the step-by-step approach:

First, use an if statement to manage the array value: if the quantity is less than 2, force the output value to be 2; if it is 2 or greater, keep the original calculation.

Next, add visibility parameters to the components within the array group. Enter the group editing mode, select each component, and assign visibility parameters. When the array quantity is 1, set the visibility of the extra component to off, preventing any error messages from appearing.

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