diff --git a/packager/react-packager/src/AssetServer/index.js b/packager/react-packager/src/AssetServer/index.js
index c9b198a50..65f1edcfc 100644
--- a/packager/react-packager/src/AssetServer/index.js
+++ b/packager/react-packager/src/AssetServer/index.js
@@ -106,7 +106,8 @@ class AssetServer {
     return (
       this._findRoot(
         this._roots,
-        path.dirname(assetPath)
+        path.dirname(assetPath),
+        assetPath,
       )
       .then(dir => Promise.all([
         dir,
@@ -138,7 +139,7 @@ class AssetServer {
     );
   }
 
-  _findRoot(roots, dir) {
+  _findRoot(roots, dir, debugInfoFile) {
     return Promise.all(
       roots.map(root => {
         const absRoot = path.resolve(root);
@@ -162,7 +163,9 @@ class AssetServer {
           return stats[i].path;
         }
       }
-      throw new Error('Could not find any directories');
+
+      const rootsString = roots.map(s => `'${s}'`).join(', ');
+      throw new Error(`'${debugInfoFile}' could not be found, because '${dir}' is not a subdirectory of any of the roots  (${rootsString})`);
     });
   }
 
@@ -194,7 +197,7 @@ class AssetServer {
 
     return map;
   }
-  
+
   _getAssetDataFromName(platform, file) {
     return getAssetDataFromName(file, platform);
   }