hopefully this fixes it

index.js

@@ -186,8 +186,9 @@ app.ws('/download/:id/:quality', async (ws, req) => {
     ws.send('Downloaded video and audio. Merging them together.')
 
     await mergeIt(`./output/${req.params.id}_audio.mp4`, `./output/${req.params.id}_video.mp4`, `./output/${req.params.id}.mp4`)
-    fs.rmSync(`./output/${req.params.id}_audio.mp4`)
-    fs.rmSync(`./output/${req.params.id}_video.mp4`)
+    
+    if (fs.existsSync(`./output/${req.params.id}_audio.mp4`)) fs.rmSync(`./output/${req.params.id}_audio.mp4`)
+    if (fs.existsSync(`./output/${req.params.id}_video.mp4`)) fs.rmSync(`./output/${req.params.id}_video.mp4`)
 
     ws.send('done')
     ws.close()

package.json

@@ -9,6 +9,6 @@
     "express-ws": "^5.0.2",
     "ffmpeg-static": "^5.2.0",
     "fluent-ffmpeg": "^2.1.3",
-    "youtubei.js": "^11.0.1"
+    "youtubei.js": "^12.2.0"
   }
 }

yarn.lock

@@ -393,10 +393,10 @@ isexe@^2.0.0:
   resolved "https://registry.yarnpkg.com/isexe/-/isexe-2.0.0.tgz#e8fbf374dc556ff8947a10dcb0572d633f2cfa10"
   integrity sha512-RHxMLp9lnKHGHRng9QFhRCMbYAcVpn69smSGcq3f36xjgVVWThj4qqLbTLlq7Ssj8B+fIQ1EuCEGI2lKsyQeIw==
 
-jintr@^3.0.2:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/jintr/-/jintr-3.0.2.tgz#633ecc8da930d25f5004697acb5af4ff36628f26"
-  integrity sha512-5g2EBudeJFOopjAX4exAv5OCCW1DgUISfoioCsm1h9Q9HJ41LmnZ6J52PCsqBlQihsmp0VDuxreAVzM7yk5nFA==
+jintr@^3.2.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/jintr/-/jintr-3.2.0.tgz#38bfc2311c7ed4412ebe0bfc5c2e700f8f433921"
+  integrity sha512-psD1yf05kMKDNsUdW1l5YhO59pHScQ6OIHHb8W5SKSM2dCOFPsqolmIuSHgVA8+3Dc47NJR181CXZ4alCAPTkA==
   dependencies:
     acorn "^8.8.0"
 
@@ -663,12 +663,12 @@ ws@^7.4.6:
   resolved "https://registry.yarnpkg.com/ws/-/ws-7.5.10.tgz#58b5c20dc281633f6c19113f39b349bd8bd558d9"
   integrity sha512-+dbF1tHwZpXcbOJdVOkzLDxZP1ailvSxM6ZweXTegylPny803bFhA+vqBYw4s31NSAk4S2Qz+AKXK9a4wkdjcQ==
 
-youtubei.js@^11.0.1:
-  version "11.0.1"
-  resolved "https://registry.yarnpkg.com/youtubei.js/-/youtubei.js-11.0.1.tgz#5729bbf2df8dff58c3555140d23ae83c458f0b34"
-  integrity sha512-ZsbOd+5XF2Ofi3FrLMfYd+f9g9H8xswlouFhjhOqbwT68dMJtX6CRGsHNj5VTFCR/+L/865x1lnUlllB2dDDTA==
+youtubei.js@^12.2.0:
+  version "12.2.0"
+  resolved "https://registry.yarnpkg.com/youtubei.js/-/youtubei.js-12.2.0.tgz#54f058b5d0892b5c7e35019e2be6a2a7f7ba4447"
+  integrity sha512-G+50qrbJCToMYhu8jbaHiS3Vf+RRul+CcDbz3hEGwHkGPh+zLiWwD6SS+YhYF+2/op4ZU5zDYQJrGqJ+wKh7Gw==
   dependencies:
     "@bufbuild/protobuf" "^2.0.0"
-    jintr "^3.0.2"
+    jintr "^3.2.0"
     tslib "^2.5.0"
     undici "^5.19.1"