During the array configuration, you selected a second array configuration. But you do not have enough available second array sites. For multiple site arrays, each array site selected from the Array configuration panel represents the first of two array-sites for the array. If you select more than one array-site during the array configuration, then the system verifies enough second array sites exist to populate the first array-site selections. The system analyzes available arrays, matching types and loops. You must have enough available second site arrays. Once you acknowledge the warning message, you are returned to the array configuration panel where you must select fewer arrays.
Redefine your multiple site array site configuration to not exceed available arrays.