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I removed a mod (Giddy up) and it broke my game. I put the mod back in but it doesn't fix the issue.

I can create and play a new colony just fine.
I've tried validating the game files.
I've tried deleting the config folder.

Stack trace error:

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Error in Map.FinalizeLoading(): System.NullReferenceException: Object reference not set to an instance of an object
  at RimWorld.ListerFilthInHomeArea.Notify_HomeAreaChanged (Verse.IntVec3 c) [0x00000] in <99518a644a3e4a7ea3fde566568df84a>:0
  at RimWorld.ListerFilthInHomeArea.RebuildAll () [0x00025] in <99518a644a3e4a7ea3fde566568df84a>:0
  at (wrapper dynamic-method) Verse.Map.Verse.Map.FinalizeInit_Patch2(Verse.Map)
  at (wrapper dynamic-method) Verse.Map.Verse.Map.FinalizeLoading_Patch1(Verse.Map)
  at (wrapper dynamic-method) Verse.Game.Verse.Game.LoadGame_Patch1(Verse.Game)
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch1 (string)
(wrapper dynamic-method) Verse.Game:Verse.Game.LoadGame_Patch1 (Verse.Game)
(wrapper dynamic-method) Verse.SavedGameLoaderNow:Verse.SavedGameLoaderNow.LoadGameFromSaveFileNow_Patch1 (string)
Verse.Root_Play/<>c:<Start>b__1_1 ()
Verse.LongEventHandler:RunEventFromAnotherThread (System.Action)
Verse.LongEventHandler/<>c:<UpdateCurrentAsynchronousEvent>b__27_0 ()
System.Threading.ThreadHelper:ThreadStart_Context (object)
System.Threading.ExecutionContext:RunInternal (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object,bool)
System.Threading.ExecutionContext:Run (System.Threading.ExecutionContext,System.Threading.ContextCallback,object)
System.Threading.ThreadHelper:ThreadStart ()

Any help would be much appreciated.

Could you give me an example that would look?

Okay I believe I understand thingClass better, but specifying thingClass as ThingWithComps doesn't make the ticker run either:

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<?xml version="1.0" encoding="utf-8"?>
<Defs>
<ThingDef>
<defName>Ticker</defName>
<tickerType>Normal</tickerType>
<thingClass>ThingWithComps</thingClass>
        <comps>
            <li Class="MyExampleNamespace.MyExampleCompProperties">
                <myExampleBool>false</myExampleBool>
                <myExampleFloat>0.005</myExampleFloat>
            </li>
        </comps>
    </ThingDef>
</Defs>

I've updated the def to specify the class:

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<?xml version="1.0" encoding="utf-8"?>
<Defs>
<ThingDef>
<defName>Ticker</defName>
<tickerType>Normal</tickerType>
<thingClass>MyExampleNamespace.MyExampleComp</thingClass>
        <comps>
            <li Class="MyExampleNamespace.MyExampleCompProperties">
                <myExampleBool>false</myExampleBool>
                <myExampleFloat>0.005</myExampleFloat>
            </li>
        </comps>
    </ThingDef>
</Defs>

Unfortunately I'm still not seeing anything in the dev logs, indicating the ticker isn't working, so I feel like I'm misunderstanding you.

I'm new to modding and C#, so I've been reading a bunch of tutorials. I also successfully followed the Plague Gun mod tutorial:
https://rimworldwiki.com/wiki/Plague_Gun/Introduction

The big issue that is stumping me is that my class that is derived from ThingComp doesn't work at all. I've created a sample mod that uses the exact code listed on the wiki (except I added tickerType to the xml), added the mod to the game, but CompTick doesn't seem to execute at all: https://rimworldwiki.com/wiki/Modding_Tutorials/ThingComp

How can I properly override ThingComp so CompTick will execute?

TickerMod.xml:

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<?xml version="1.0" encoding="utf-8"?>
<Defs>
<ThingDef>
<tickerType>Normal</tickerType>
        <comps>
            <li Class="MyExampleNamespace.MyExampleCompProperties">
                <myExampleBool>false</myExampleBool>
                <myExampleFloat>0.005</myExampleFloat>
            </li>
        </comps>
    </ThingDef>
</Defs>

MyExampleNamespace.cs:

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using Verse;
using System;

namespace MyExampleNamespace
{
    public class MyExampleComp : ThingComp
    {
        public override void CompTick()
        {
            Log.Error("Let's error on every tick!");
        }

        /// <summary>
        /// By default props returns the base CompProperties class.
        /// You can get props and cast it everywhere you use it,
        /// or you create a Getter like this, which casts once and returns it.
        /// Careful of case sensitivity!
        /// </summary>
        public MyExampleCompProperties Props => (MyExampleCompProperties)this.props;

        public bool ExampleBool => Props.myExampleBool;
    }

    public class MyExampleCompProperties : CompProperties
    {
        public bool myExampleBool;
        public float myExampleFloat;

        /// <summary>
        /// These constructors aren't strictly required if the compClass is set in the XML.
        /// </summary>
        public MyExampleCompProperties()
        {
            this.compClass = typeof(MyExampleComp);
        }

        public MyExampleCompProperties(Type compClass) : base(compClass)
        {
            this.compClass = compClass;
        }
    }
}