OMP 3.2.0.3 publications formats publication date

When I go to change Publication Date for a book, I go for the edit Metadata for them:

Publication Formats > Edit metadata fields >Metadata

when i do click in Edit link the following error appears and
“Failed Ajax request or invalid JSON returned”
Can do nothing more

The error log file shows this error:
omp: 404 Not Found, referer: http://editorial.agrosavia.co/index.php/publicaciones/workflow/index/70/5

Any suggestion?