I've been having this problem for quite a while - at least 6 months now.
Every single time I try to play the Spring Collab, Everest immediately crashes before I even get to the main menu. I do not have any problems loading other mods, it's literally just the Spring Collab that causes it.
With the release of Strawberry Jam, I decided to once again try out the Spring Collab because I want to play that first before doing Strawberry Jam, but I have run into the exact same error as I always have.
I am able to run Strawberry Jam just fine, but the Spring Collab is still inaccessible to me.
I have attached both the error_log and the log.txt from my most recent attempt at running the mods.
Before anyone asks, no, my game does not save to One Drive. I genuinely don't understand why I'm getting a cloud file provider error, because I don't use the cloud to store any of my Celeste files.