Model failed to converge: degenerate  Hessian with 2 negative eigenvalues

Model failed to converge: degenerate  Hessian with 1 negative eigenvalues

Model failed to converge with max|grad| = 0.00438095 (tol = 0.001, component 1)

Model failed to converge with max|grad| = 0.00817296 (tol = 0.001, component 1)

Model failed to converge with max|grad| = 1.14544 (tol = 0.001, component 1)

R Under development (unstable) (2015-04-24 r68262)

Derivative-Free optimization algorithms. These algorithms
        do not require gradient information. More importantly, they can
        be used to solve non-smooth optimization problems.

Ravi Varadhan, Johns Hopkins University, and Hans W. Borchers,
        ABB Corporate Research.

Jelmer Ypma <uctpjyy@ucl.ac.uk>, with contributions by
        Hans W. Borchers <hwborchers@googlemail.com> and 
        Dirk Eddelbuettel <edd@debian.org>

nloptr is an R interface to NLopt. NLopt is a free/open-source library for
    nonlinear optimization, providing a common interface for a number of
    different free optimization routines available online as well as original
    implementations of various other algorithms.
    See http://ab-initio.mit.edu/wiki/index.php/NLopt_Introduction for more
    information on the available algorithms. During installation on Unix the
    NLopt code is downloaded and compiled from the NLopt website.

A Replacement and Extension of the optim() Function

c( person(given = c("John", "C"), family = "Nash", role =
    c("aut", "cre"), email = "nashjc@uottawa.ca"), person(given =
    "Ravi", family = "Varadhan", role = "aut", email =
    "RVaradhan@jhmi.edu"), person(given = "Gabor", family =
    "Grothendieck", role = "ctb", email =
    "ggrothendieck@gmail.com") )

John C Nash [aut, cre], Ravi Varadhan [aut], Gabor Grothendieck [ctb]

Provides a replacement and extension of the optim()
    function to unify and streamline optimization capabilities in R
    for smooth, possibly box constrained functions of several or
    many parameters. This is the CRAN version of the package.