diff --git a/frontend/app/video/subtitles/page.tsx b/frontend/app/video/subtitles/page.tsx
index 87edd28..03d37a7 100644
--- a/frontend/app/video/subtitles/page.tsx
+++ b/frontend/app/video/subtitles/page.tsx
@@ -149,7 +149,18 @@ export default function SubtitlesPage() {
 
       toast.success('Subtitle processing started!');
     } catch (err: any) {
-      toast.error(err.response?.data?.detail || 'Failed to start processing');
+      console.error('Subtitle processing error:', err);
+
+      // Handle validation errors (array of error objects)
+      if (err.response?.data?.detail && Array.isArray(err.response.data.detail)) {
+        const errorMessages = err.response.data.detail.map((e: any) => e.msg || JSON.stringify(e)).join(', ');
+        toast.error(`Validation error: ${errorMessages}`);
+      } else if (typeof err.response?.data?.detail === 'string') {
+        toast.error(err.response.data.detail);
+      } else {
+        toast.error('Failed to start processing');
+      }
+
       setLoading(false);
     }
   };