package mediawiki 1:1.19.14+dfsg-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Sumeet Kumar Sinha]

I don't know whats the error

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: mediawiki 1:1.19.14+dfsg-1
ProcVersionSignature: Ubuntu 3.19.0-42.48~14.04.1-generic 3.19.8-ckt10
Uname: Linux 3.19.0-42-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
Date: Mon Dec 21 00:37:31 2015
DuplicateSignature: package:mediawiki:1:1.19.14+dfsg-1:subprocess installed post-installation script returned error exit status 1
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationDate: Installed on 2015-11-03 (55 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
RelatedPackageVersions:
 dpkg 1.17.5ubuntu5.5
 apt 1.0.1ubuntu2.10
SourcePackage: mediawiki
Title: package mediawiki 1:1.19.14+dfsg-1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: No upgrade log present (probably fresh install)
mtime.conffile..etc.mediawiki.apache.conf: 2015-12-21T00:40:58.322381