error in gedit terminal can't edit a file

[RAZAFINDRAMIARINA Anna]

When try to edit a file, this errors are showed:

** (gedit:10151): WARNING **: Set document metadata failed: La définition de l’attribut metadata::gedit-spell-enabled n’est pas prise en charge

** (gedit:10151): WARNING **: Set document metadata failed: La définition de l’attribut metadata::gedit-encoding n’est pas prise en charge

And the change in the file can't be saved.

Description: Ubuntu 16.04.4 LTS
Release: 16.04
root@anna-HP:/home/anna# apt-cache policy pkgname
N: Impossible de trouver le paquet pkgname

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gedit 3.18.3-0ubuntu4
ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: amd64
Date: Sun Apr 15 21:38:42 2018
InstallationDate: Installed on 2018-04-12 (3 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
SourcePackage: gedit
UpgradeStatus: No upgrade log present (probably fresh install)

[Steve Beattie (sbeattie)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.