Astra Anima

I suppose I may as well introduce myself here, since I've posted in a bug thread already. Hey, I'm Astra. I've been playing KSP since Alpha 0.18 and having a blast with it ever since. KSP got me into realistic spaceflight and completely changed the way that I look at science fiction, which is a sentiment I often see on the internet. As a writer I've appreciated how it's helped me to grow, and as a player I've loved having a sandbox to play around with realistic spaceflight principles and the sheer breadth of options available with modding. I almost never play stock these days and have been intending for years now to do a full career playthrough of Near Future and Far Future technologies. I may be around more often now that I've introduced myself, though I am a chronic lurker, so I may continue to do so into the future. Regardless, introducing myself seemed prudent.

Thank you very much for the prompt and informative reply, this will help a lot moving forward. Glad to hear it's an easily fixed issue. I just have one question--how did you trace it to NeistAir? Does it show the name of the part in that error? I assumed it was a code, not the actual part name.

I'm encountering a fatal error that TweakScale is telling me to bring here. One part has a show-stopping error. The log file is massive because I'm running about 150 mods, but I've uploaded it here: https://www.dropbox.com/s/yckjodgnzwc0lw3/KSP.log?dl=0 This issue started after I installed a few extra mods relating to spaceplane parts, but I don't know if that's the source or if it's something else that's been lurking longer. This is my first time asking for help with a mod-related issue, so let me know if there's further information that I need to include. Thank you for your time.