Input String Was Not In The Correct Format?

[Angelo Kerman]

I've just successfully converted my mods over to KSP 1.3, and can create a new save with the mods installed, and everything works great. Unfortunately though I'm running into an odd problem with an existing test-save from KSP 1.2.2. Whenever I try to load the save, I get this:

Clearly there's an input string that's not in the correct format in the save, but I'm at a loss as to how to resolve it. For my test save it's not a big deal, but for my career save, it is. Any ideas on how to troubleshoot this?

[Angelo Kerman]

Turns out the problem can occur if you change the format of one of your scenario variables from, say, float to integer...