add log

examcloud-core-questions-api-provider/src/main/java/cn/com/qmth/examcloud/core/questions/api/controller/ImportPaperController.java

@@ -93,6 +93,7 @@ public class ImportPaperController extends ControllerSupport {
 		} catch (StatusException e) {
 			throw e;
 		} catch (Exception e) {
+			LOG.error(e.getMessage(), e);
 			throw new StatusException("500", e.getMessage());
 		}
 	}