package redmine 4.0.6-2 failed to install/upgrade: installed redmine package post-installation script subprocess returned error exit status 1

i don't know

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: redmine 4.0.6-2
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
CasperMD5CheckResult: skip
Date: Fri Oct 9 00:56:23 2020
ErrorMessage: installed redmine package post-installation script subprocess returned error exit status 1
InstallationDate: Installed on 2020-09-23 (23 days ago)
InstallationMedia: Ubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
PackageArchitecture: all
Python3Details: /usr/bin/python3.8, Python 3.8.5, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: redmine
Title: package redmine 4.0.6-2 failed to install/upgrade: installed redmine package post-installation script subprocess returned error exit status 1
UpgradeStatus: Upgraded to focal on 2020-10-09 (8 days ago)