Update index.html

index.html

@@ -433,8 +433,15 @@
                     });
 
                     if (!response.ok) {
-                        const error = await response.json();
-                        throw new Error(error.error || 'Failed to fetch audio from API.');
+                        let errorMessage = `API Error: ${response.status} ${response.statusText}`;
+                        try {
+                            const errorDetails = await response.json();
+                            errorMessage = errorDetails.error || JSON.stringify(errorDetails);
+                        } catch (e) {
+                            // If JSON parsing fails, it's likely a plain text error (like 'Not Found')
+                            errorMessage = await response.text();
+                        }
+                        throw new Error(errorMessage);
                     }
                     
                     const audioBlob = await response.blob();