Syntax problems with directory naming

[TheRealArelium]

Describe the bug
The best way to explain this would be: The game fails during loading and says this:
Loading has failed due to an unhandled error

Failure in subsystem : Internal props compilation
Prop: ASET/ASET_Avionics/ClassicPack/ASET_HSI/ASET_HSI/ASET_HSI

System.ArgumentException: Failed finding fallback font LiberationSans-Regular
at JSI.JUtil.LoadFont (System.String fontName, System.Int32 size) [0x000a5] in <58139aec46d24f42bbb109c90ea38e7c>:0
at JSI.JSILabel+TextBatchInfo.OnLoad (ConfigNode node) [0x00048] in <58139aec46d24f42bbb109c90ea38e7c>:0
at JSI.JSILabel.OnLoad (ConfigNode node) [0x00022] in <58139aec46d24f42bbb109c90ea38e7c>:0
at InternalModule.Load (ConfigNode node) [0x00031] in <4b449f2841f84227adfaad3149c8fdba>:0
at InternalProp.AddModule (ConfigNode node) [0x0005b] in <4b449f2841f84227adfaad3149c8fdba>:0
at InternalProp.Load (ConfigNode node) [0x0011b] in <4b449f2841f84227adfaad3149c8fdba>:0
at PartLoader.LoadInternalProp (UrlDir+UrlConfig urlConf) [0x000df] in <4b449f2841f84227adfaad3149c8fdba>:0
at PartLoader+d__75.MoveNext () [0x000c3] in <4b449f2841f84227adfaad3149c8fdba>:0
at KSPCommunityFixes.Performance.KSPCFFastLoader+d__77.MoveNext () [0x0006c] in <62bb7f5420994f409a34377c091e8538>:0

I tried installing LiberationSans-Regular and that doesn't work either.

KSP.log file
KSP.log

To Reproduce
I do not know why this happens, so I also can't give insturctions on reproducing.

Expected behavior
For the game to load without issues.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):
Windows

Additional context
The mod works with my other instance, which I also tried copying the files from but it still didn't work with this instance.

[TheRealArelium]

I think the issue is with naming. My instance was named "Vanilla+". Copying my other instance completely didn't work so I decided to copy it to a new instance named "VanillaPP", and that worked. So it's just a syntax issue - a very stupid one.

I've changed the title to "Syntax problems with directory naming".