(Posting as a discussion since I am unable to comment)
The mod was working fine a few weeks ago, but now I am getting the following issue.

Version Info:
- Java version (1.8.0_361)
- Slay the Spire (null)
- ModTheSpire (3.30.3)
Mod list:
- basemod (5.51.1)
- stslib (1.24.1)
- theVacant (1.0.1)

Begin patching...
Patching enums...
javassist.NotFoundException: com.megacrit.cardcrawl.screens.mainMenu.MainMenuScreen$CurScreen
at javassist.ClassPool.get(ClassPool.java:445)
at javassist.bytecode.Descriptor.toCtClass(Descriptor.java:592)
at javassist.bytecode.Descriptor.toCtClass(Descriptor.java:542)
at javassist.CtField.getType(CtField.java:371)
at com.evacipated.cardcrawl.modthespire.Patcher.patchEnums(Patcher.java:216)
at com.evacipated.cardcrawl.modthespire.Loader.runMods(Loader.java:429)
at com.evacipated.cardcrawl.modthespire.ui.ModSelectWindow.lambda$null$1(ModSelectWindow.java:285)
at java.lang.Thread.run(Unknown Source)