Why can't I get "equal lengths" of fitness values?

[cyasing]

I am doing a multiobjective optimization using FitnessMulti type with weights=(-1.0, 1.0) and 5 variables to be optimized. It is, however, giving me the error: "Assigned values have not the same length than fitness weights" at line:
for ind, fit in zip(pop, fitnesses): ind.fitness.values = fit.