Like the title says, I encountered an error, and found a solution on my own, but figured the dev(s) should be aware of my experience in case it proves of use. I installed the modpack on a completely vanilla installation of Factorio (for more detail - I had a few mods including Recursive Blueprints, Rate Calc., Simple Circuit Trains, and one or two others installed, but they were disabled before installing + confirming changes for the modpack). Upon the game restarting, I encountered a couple errors that forced me to remove the listed mods and attempt to reload the game. After performing this action for the errors (screenshots available via links below), the game loaded just fine. I am not sure what happened, or why, but again I figured I'd share this just in case it provides some useful info.
Troubleshooting steps taken:
- Attempted to 'restart' upon encountering first error
- Disabled listed mods until I got to title menu, then uninstalled all mods; reinstalled modpack w/ fresh, mod-free version of game. (This is what worked; Game loaded without any errors upon installation of modpack)
https://imgur.com/a/eFW2WWE
https://imgur.com/a/wTW4LNA