diff --git a/errors/manifest.json b/errors/manifest.json
index 4d42da82bef7370..6cbe3fa51e0ec9a 100644
--- a/errors/manifest.json
+++ b/errors/manifest.json
@@ -415,10 +415,6 @@
           "title": "import-esm-externals",
           "path": "/errors/import-esm-externals.md"
         },
-        {
-          "title": "max-custom-routes-reached",
-          "path": "max-custom-routes-reached.md"
-        },
         {
           "title": "static-page-generation-timeout",
           "path": "/errors/static-page-generation-timeout.md"
diff --git a/scripts/check-manifests.js b/scripts/check-manifests.js
index 7531c2efb78408f..cd3f11fb1a09847 100755
--- a/scripts/check-manifests.js
+++ b/scripts/check-manifests.js
@@ -20,7 +20,7 @@ function collectPaths(routes, paths = []) {
 
 async function main() {
   const manifests = ['errors/manifest.json', 'docs/manifest.json']
-  let hadMissing = false
+  let hadError = false
 
   for (const manifest of manifests) {
     const dir = path.dirname(manifest)
@@ -38,15 +38,27 @@ async function main() {
     )
 
     if (missingFiles.length) {
-      hadMissing = true
+      hadError = true
       console.log(`Missing paths in ${manifest}:\n${missingFiles.join('\n')}`)
     } else {
       console.log(`No missing paths in ${manifest}`)
     }
+
+    for (const filePath of paths) {
+      if (
+        !(await fs.promises
+          .access(path.join(process.cwd(), filePath), fs.constants.F_OK)
+          .then(() => true)
+          .catch(() => false))
+      ) {
+        console.log('Could not find path:', filePath)
+        hadError = true
+      }
+    }
   }
 
-  if (hadMissing) {
-    throw new Error('missing manifest items detected see above')
+  if (hadError) {
+    throw new Error('missing/incorrect manifest items detected see above')
   }
 }