代码优化及bug修复

examcloud-core-oe-websocket-api/src/main/java/cn/com/qmth/examcloud/core/oe/websocket/api/enums/WebSocketEventType.java

@@ -21,5 +21,9 @@ public enum WebSocketEventType {
 	/**
 	 * 扫描二维码
 	 */
-	SCAN_QR_CODE
+	SCAN_QR_CODE,
+	/**
+	 *系统错误
+	 */
+	SYSTEM_ERROR
 }