Serious Modded Career Playthrough Issues

[Ctrl-Z KSP]

I'm having serious problems in my career playthrough. Everything was working fine until I installed two mods this morning. 1st one was Station Science, which I have used in a previous playthrough. I've never experienced a problem with that mod in the past. 2nd one was Kerbal Environmental Institute, a mod which i have never used in the past. After playing for a little while i noticed an uncharacteristic frame rate drop on a very small craft. I assumed it was time to reboot KSP as it was using too much memory (has worked in the past). When i booted back into my career and reloaded said craft the frame rate was what seemed like single digits, kerbin was transparent, and I could not switch to my map view at all. When I switched back to the space center the game was stuck in a loading screen and never loaded up. It just doesn't seem like these two innocuous mods would have caused this problem, but I have tried the following with no luck...

1 uninstalled both mods
2 reinstalled KSP (keeping "good" mods and save file)
3 reinstalled visual mods (as i thought a transparent kerbin was a symptom of broken visual mods)
4 tried loading previous saves

I'm not experienced at this sort of stuff but i dug into my log and im getting a "null reference" from what seems like Kopernicus.
5) I reinstalled Kopernicus and the Outer Planets Mod also to no avail.

There is also mention of "null reference" with Unity in the line so i'm not sure if its a problem with my game file. I went to validate game files in steam and it says 74 filed failed to validate. This happens every time I load the game and quit. These 74 files always need to be required. Does anyone have ANY idea at all about what is going wrong here and what i can do to correct it? Can you point me in the direction of a forum in which I can post my issue? I've spent my entire day off messing with trying to fix this problem and I'm extremely disheartened lol. I don't want to start another career playthrough as i've already done so after the 1.7 update in order to fully use the surface features and phase out ven's stock revamp. I've just made too much progress this time. ANY HELP would be appreciated. Thanks!!

log info:

https://www.dropbox.com/s/64d0vumg5wjo08c/KSP.log?dl=0

 

EDIT:

someone on reddit pointed out that the latest version of transfer window planner has a serious bug. i rolled back a version and all seems to be well so far! i can't seem to figure out how to delete this post.

Edited August 29, 2019 by Ctrl-Z KSP

[Serenity]

20 hours ago, Ctrl-Z KSP said:

There is also mention of "null reference" with Unity in the line so i'm not sure if its a problem with my game file. I went to validate game files in steam and it says 74 filed failed to validate. This happens every time I load the game and quit. These 74 files always need to be required. Does anyone have ANY idea at all about what is going wrong here and what i can do to correct it? Can you point me in the direction of a forum in which I can post my issue? I've spent my entire day off

I know you found the solution, i just wanted to add that sometimes Cloud Saving in Steam causes the files that always need to be required.

So just in case its that, you can and should disable it for Kerbal.

[Ctrl-Z KSP]

thanks man I had no idea. ill def do this.