diff --git a/4G/4g.c b/4G/4g.c
index 97093f5..2066e55 100644
--- a/4G/4g.c
+++ b/4G/4g.c
@@ -11,4 +11,9 @@ void sch_4g_set_parameter(char * param)
 
 void sch_4g_get_parameter(char *param)
 {
+}
+
+void sch_4g_check_error(void)
+{
+	
 }
\ No newline at end of file