Can't open password databases created with KeePass 2.35

[Eero]

The error message says:

Failed to load the specified file!

The file version is unsupported.

A newer KeePass version is required to open this file.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: keepass2 2.32+dfsg-1
ProcVersionSignature: Ubuntu 4.4.0-71.92-generic 4.4.49
Uname: Linux 4.4.0-71-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Apr 17 11:35:20 2017
InstallationDate: Installed on 2017-02-05 (70 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: keepass2
UpgradeStatus: No upgrade log present (probably fresh install)

[Julian Taylor (jtaylor)]

This is not a bug, the database format changed in 2.35. You have to export it in the older format to open it in older versions.