diff --git a/Podfile b/Podfile
index 78fb3e2..1702b02 100644
--- a/Podfile
+++ b/Podfile
@@ -1,4 +1,5 @@
 source "https://github.com/CocoaPods/Specs.git"
+# source 'https://mirrors.tuna.tsinghua.edu.cn/git/CocoaPods/Specs.git'
 
 platform :ios, 8.0
 
diff --git a/VirtualView/Core/VVErrors.h b/VirtualView/Core/VVErrors.h
index 7de9cc5..9ec40fc 100644
--- a/VirtualView/Core/VVErrors.h
+++ b/VirtualView/Core/VVErrors.h
@@ -9,7 +9,11 @@
 
 FOUNDATION_EXTERN NSErrorDomain const VVErrorDomain;
 
+#if __IPHONE_OS_VERSION_MAX_ALLOWED <=  __IPHONE_10_2
+NS_ENUM(NSInteger) {
+#else
 NS_ERROR_ENUM(VVErrorDomain) {
+#endif
     VVUnknownError = 0,
     VVNeedToBeOverridedError,
     VVWrongHeaderError,