[SOLVED!] SIMS 4 [STAR] ERROR MESSAGE?

So, I noticed that my CAS creation wasn't showing the custom swatch thumbnails I imported into S4S whenever I went in-game. I would see that llama picture so I looked around the forum and found that it may be due to thumbnail size? Though my previous CC creation was perfectly fine with that size. Now, I tried to resize my thumbnails and re-import them but I started getting this error message on the last three which I worked around by clearing before importing. Until it also appeared when I tried to save: 

The Sims 4 Studio - Version 3.2.0.3

System.InvalidOperationException: Operations that change non-concurrent collections must have exclusive access. A concurrent update was performed on this collection and corrupted its state. The collection's state is no longer correct.

at System.Collections.Generic.Dictionary`2.FindValue(TKey key)

at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value)

at S4Studio.Data.IO.Package.DBPFPackage.WriteDataStream(Stream src_stream, FileStream final_stream)

at S4Studio.Data.IO.Package.DBPFPackage.SaveTempPackage(String out_file, String tmp, Stream pkg_stream)

at S4Studio.Data.IO.Package.DBPFPackage.Save(String out_file, Boolean inline, String temp_path)

at S4Studio.Shared.StudioDocumentModel.Save(String filename)