Backup file crash #343

Hello,

After working for days on a railmap I was nearly finished. The only thing I had to do was place everything on the right cordinates to make sure the aspact ratio was perfect. When I selected everything and moved it the whole page crashed. In the crash message it said to download a backup and refresh the website to clear the cache. So I did. But when trying to import the backup file it gives a unknown error message. It looks like the problem of the first error made it into the backup file. Is this problem resolveble? It would be terrible to start all over again.
I’ve attached the backup file in case some on knows how to fix it.

Kind regards,