diff --git a/index.html.tmpl b/index.html.tmpl
index 39e3983..07e90af 100644
--- a/index.html.tmpl
+++ b/index.html.tmpl
@@ -57,7 +57,7 @@
         }
         button:hover { background: #555; }
         .progress-container {
-            width: 100%%;
+            width: 100%;
             background: #ddd;
             border-radius: 4px;
             margin: 10px 0;
@@ -65,7 +65,7 @@
             display: none;
         }
         .progress-bar {
-            height: 100%%;
+            height: 100%;
             background: #333;
             border-radius: 4px;
             width: 0;
@@ -152,7 +152,7 @@
             }
 
             progressContainer.style.display = 'block';
-            progressBar.style.width = '0%%';
+            progressBar.style.width = '0%';
             results.innerHTML = '';
 
             const xhr = new XMLHttpRequest();
@@ -160,7 +160,7 @@
             xhr.upload.addEventListener('progress', (e) => {
                 if (e.lengthComputable) {
                     const percent = (e.loaded / e.total) * 100;
-                    progressBar.style.width = percent + '%%';
+                    progressBar.style.width = percent + '%';
                 }
             });
 
@@ -169,9 +169,20 @@
                     const response = JSON.parse(xhr.responseText);
                     displayResults(response.urls);
                 } else {
-                    results.innerHTML = '<div class="result-item">Upload failed: ' + xhr.statusText + '</div>';
+                    let message = xhr.statusText;
+                    try {
+                        const response = JSON.parse(xhr.responseText);
+                        if (response.error) {
+                            message = response.error;
+                        }
+                    } catch (e) {
+                        if (xhr.responseText) {
+                            message = xhr.responseText;
+                        }
+                    }
+                    results.innerHTML = '<div class="result-item">Upload failed: ' + message + '</div>';
                 }
-                progressBar.style.width = '100%%';
+                progressBar.style.width = '100%';
             });
 
             xhr.addEventListener('error', () => {