optimisation : Error in solve.default(object$Hessian)

General
1

Hello,
i need help to reslove this :
Probably i need toc change Hessian in my

full <- dbchoice(data$anti0 + data$pro0 ~ 1 + data$age + data$voiture+data$Rv+data$educ+data$EffEvt | data$antiwtp + data$prowtp, dist = "weibull", data = data)

Error in solve.default(object$Hessian) : routine Lapack dgesv : le système est exactement singulier : U[1,1] = 0
5.
solve.default(object$Hessian)
4.
solve(object$Hessian)
3.
diag(solve(object$Hessian))
2.
summary.dbchoice(full)
1.
summary(full)

2

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