diff --git a/src/components/HorizontalTimeline.tsx b/src/components/HorizontalTimeline.tsx
index 3fd6ced34556dac3d9efc233017ddafe5cad71fa..f32d898b46a7c4e5266331cecd8983241dbee09e 100644
--- a/src/components/HorizontalTimeline.tsx
+++ b/src/components/HorizontalTimeline.tsx
@@ -64,7 +64,7 @@ function TimeItem({color, tag, title, children, pic, author, tabid}: ItemProps){
   }
   
   function Open({person}:{person: string}){
-    const openPop =  (event : React.MouseEvent<HTMLButtonElement, MouseEvent>) => {
+    const openPop =  (_event : React.MouseEvent<HTMLButtonElement, MouseEvent>) => {
       var popup = document.getElementById(person);
       popup!.classList.toggle("show");
     }
diff --git a/src/contents/wiki.tsx b/src/contents/wiki.tsx
index 5a986cae3c89bc08138fb1df90acba272ef56e0a..86c47b05d8080533b9c7024b3d76fea0528161d1 100644
--- a/src/contents/wiki.tsx
+++ b/src/contents/wiki.tsx
@@ -122,6 +122,25 @@ function Troubleshooting(){
       Simply rename the function in one of the modules or consider making it a component if you plan on using it frequently.  
       </Collapsible>
 
+      <h4>Failed Pipelines</h4>
+      <Collapsible title="error TS6133: 'event' is declared but its value is never read.">
+        <h6>Example</h6>
+        HorizontalTimeline.tsx: 
+        <div className="error">
+          $ yarn build
+          <p>yarn run v1.22.19</p>
+          <p>$ tsc && vite build</p>
+          <p>src/components/HorizontalTimeline.tsx(67,23): error TS6133: 'event' is declared but its value is never read.
+          error Command failed with exit code 2.</p>
+          <p>info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.</p>
+          </div>
+        <p>in</p>
+        <code>
+        const openPop =  (event : React.MouseEvent&lt;HTMLButtonElement, MouseEvent&gt;) =&gt; {}
+        </code>
+        <h6>Solutions</h6>
+      </Collapsible>
+      
     </div>
   )
 }
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