From 69839f8a9a64e06347a17d802d0f89bd3634fcd2 Mon Sep 17 00:00:00 2001
From: wangguanzhong <jerrywgz@126.com>
Date: Wed, 6 Jan 2021 17:40:15 +0800
Subject: [PATCH] fix error message for distribute_fpn_proposals_op (#30116)

---
 paddle/fluid/operators/detection/distribute_fpn_proposals_op.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/paddle/fluid/operators/detection/distribute_fpn_proposals_op.h b/paddle/fluid/operators/detection/distribute_fpn_proposals_op.h
index 79498f0153..465435637c 100644
--- a/paddle/fluid/operators/detection/distribute_fpn_proposals_op.h
+++ b/paddle/fluid/operators/detection/distribute_fpn_proposals_op.h
@@ -84,7 +84,8 @@ class DistributeFpnProposalsOpKernel : public framework::OpKernel<T> {
       PADDLE_ENFORCE_EQ(fpn_rois->lod().size(), 1UL,
                         platform::errors::InvalidArgument(
                             "DistributeFpnProposalsOp needs LoD "
-                            "with one level."));
+                            "with one level. But received level is %d",
+                            fpn_rois->lod().size()));
     }
 
     std::vector<size_t> fpn_rois_lod;