diff --git a/build.sh b/build.sh
index 1d0fcb5..fa47188 100755
--- a/build.sh
+++ b/build.sh
@@ -88,11 +88,12 @@ make
 
 if [ $? -ne 0 ];then
    echo "--------------------------------------make fail---------------------------------------"
-   exit 1
-fi
+   #exit 1          # commented, we should restore the CMakeLists.txts...
+else
    echo "--------------------------------------make succeed------------------------------------"
+fi
 
-make
+#make
 
 if [ -f ../code_device/hgsane/CMakeLists.txtbkp ]; then
     mv ../code_device/hgsane/CMakeLists.txtbkp ../code_device/hgsane/CMakeLists.txt
diff --git a/hgdriver/hgdev/hg_scanner_200.cpp b/hgdriver/hgdev/hg_scanner_200.cpp
index dc8985d..3f3e001 100644
--- a/hgdriver/hgdev/hg_scanner_200.cpp
+++ b/hgdriver/hgdev/hg_scanner_200.cpp
@@ -384,8 +384,11 @@ void hg_scanner_200::thread_handle_usb_read(void)
 					break;
 				}
 			}
-			//else
+			else
+			{
 			//	notify_ui_working_status(hg_scanner::error_description((scanner_err)prev_err).c_str(), SANE_EVENT_ERROR, prev_err);
+				HG_VLOG_MINI_1(LOG_LEVEL_WARNING, "-x-x-x-: USB thread error: %s\n", hg_scanner::strerr((scanner_err)prev_err).c_str());
+			}
 			prev_err = ret;
 		}
 		this_thread::sleep_for(chrono::milliseconds(2));