Solved: Cannot start CumulusMX: Unhandled Exception - Devart.Data

[sutne]

I can no longer start CumuluxMX:

sudo mono CumulusMX.exe

Unhandled Exception:
System.IO.FileNotFoundException: Could not load file or assembly 'Devart.Data, Version=5.0.1181.0, Culture=neutral, PublicKeyToken=09af7300eec23701' or one of its dependencies.
File name: 'Devart.Data, Version=5.0.1181.0, Culture=neutral, PublicKeyToken=09af7300eec23701'
[ERROR] FATAL UNHANDLED EXCEPTION: System.IO.FileNotFoundException: Could not load file or assembly 'Devart.Data, Version=5.0.1181.0, Culture=neutral, PublicKeyToken=09af7300eec23701' or one of its dependencies.
File name: 'Devart.Data, Version=5.0.1181.0, Culture=neutral, PublicKeyToken=09af7300eec23701'

This is version 3063 which has been running fine for some weeks. The only thing I did before this happened was checking packages:
sudo apt update
sudo apt list - -upgradable

But I did not upgrade anything.

Anyone know what is happening here?

Edit: reinstallation of CumulusMX.3063 solved the problem.
(I also updated all packages in Raspbian Jessie)

[mcrossley]

One of these two files must have been deleted...
Devart.Data.dll
or
Devart.Data.MySql.dll

[sutne]

Yes, looking in the old folder I can see Devart.Data.dll is missing. When I searched yesterday I noticed I had Devart.Data.MySql.dll and did not know it should have been two of them.

But luckily it is very easy to do a new install, rename the old folder, install new and copy over data- and web-folder pluss som config files. These files I have in several backups.

Thank you.

Steinar