Chance-constrained programs (CCPs) are stochastic models that allow one or more sets of constraints to be violated up to a specified percentage of total scenarios.  Each random variable in a CCP must appear in a CCP constraint set.  TYou will get this error message when a random variable is found in a row not contained in any CCP set.   Refer to the documentation on @SPCHANCE for information on how to add a constraint  to a CCP set.