Fix V2 identity queue validation by filling unused ref slots.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/utils/comfy.ts

@@ -77,6 +77,29 @@ export function comfyInputFilename(original: string, jobId?: string) {
   return `aigen_${id}_${base}${ext}`
 }
 
+function comfyQueueMessage(payload: unknown, status: number) {
+  const body = payload as {
+    error?: { message?: string; details?: string }
+    node_errors?: Record<string, {
+      class_type?: string
+      errors?: Array<{ message?: string; details?: string; extra_info?: { input_name?: string } }>
+    }>
+  }
+  const parts: string[] = []
+  const headline = String(body.error?.message || '').trim()
+  const extra = String(body.error?.details || '').trim()
+  if (headline) parts.push(headline)
+  if (extra) parts.push(extra)
+  for (const [id, node] of Object.entries(body.node_errors || {})) {
+    for (const item of node.errors || []) {
+      const bit = [item.message, item.details, item.extra_info?.input_name].filter(Boolean).join(' — ')
+      if (bit) parts.push(`${node.class_type || `Node ${id}`}: ${bit}`)
+    }
+  }
+  const message = [...new Set(parts.filter(Boolean))].join('. ')
+  return message || `Queue failed (${status})`
+}
+
 export async function queuePrompt(graph: unknown, clientId: string) {
   const res = await comfyFetch('/prompt', {
     method: 'POST',
@@ -85,10 +108,7 @@ export async function queuePrompt(graph: unknown, clientId: string) {
   })
   const payload = await res.json().catch(() => ({}))
   if (!res.ok) {
-    const message = (payload as { error?: { message?: string } }).error?.message
-      || (payload as { node_errors?: unknown }).node_errors
-      || `Queue failed (${res.status})`
-    throw createError({ statusCode: 502, statusMessage: String(message), data: payload })
+    throw createError({ statusCode: 502, statusMessage: comfyQueueMessage(payload, res.status), data: payload })
   }
   return payload as { prompt_id: string; number?: number }
 }