A technical note concerning one example

Our aim is to correct one mistake that appeared in (Nonlinear Anal. Theory Methods Appl. 26 (1996) 55, Example 2.1. and Example 5.1.) and (Nonlinear Anal. Theory Methods Appl. 36 (1999) 595, Example 2.2.) in calculation of certain Cominetti–Correa generalized second-order derivative introduced in SIAM J. Control Optim. 28 (1990) 789.