Class Swift_KeyCache_DiskKeyCache does not exist

Hi,
Not a developer or anything, but :-) I just started my first Grav site. Been on Joomla many years with RocketTheme - but wanted to try something new !!

Can't however get the contact-form on this page http://ortendahlsfond.se/kontakt to send. Just get a server error:

Server Error
Sorry, something went terribly wrong!
-1 - Class Swift_KeyCache_DiskKeyCache does not exist
For further details please review your logs/ folder, or enable displaying of errors in your system configuration.

The log offers maybe som help - if I could understand it - but I don't speak "code-language"

Anyone with a clue ?

Torbjörn // C4

I removed the form page.- couldn't make it work.

Hi, that class belongs to a library used by the Email plugin (called SwiftMailer). I suspect the user/plugins/email/vendor folder is empty. Is this the case? If so, you might have pushed the site via Git but kept vendor in the .gitignore (guessing)

Thanks - I'll check it out.
Nice to get a point where to start looking - I'm not a developer, just a happy dabbler (amateur) .