ios vpnmanger其他应用已打开vpn，然后我的应用会发生错误

Question

我遇到一个问题，如果另一个应用程序已打开其vpn，则当iPhone进入我的应用程序时，我的应用程序的vpn会发生错误。

以下是我的代码：

[NETunnelProviderManager loadAllFromPreferencesWithCompletionHandler:^(NSArray<NETunnelProviderManager *> * _Nullable managers, NSError * _Nullable error) {
    if (managers.count > 0) {
        self.vpnManager = managers[0];
        log4cplus_error("TVU_Router", "%s -  The vpn already configured. We will use it.",ModuleName);
        return;
    }else {
        log4cplus_error("TVU_Router", "%s -  The vpn config is NULL, we will config it later.",ModuleName);
    }

    [self.vpnManager loadFromPreferencesWithCompletionHandler:^(NSError * _Nullable error) {
        if (error != 0) {
            const char *errorInfo = [NSString stringWithFormat:@"%@",error].UTF8String;
            log4cplus_error("TVU_Router", "%s -  applyVpnConfiguration loadFromPreferencesWithCompletionHandler Failed - %s !",ModuleName,errorInfo);
            return;
        }

        NETunnelProviderProtocol *protocol = [[NETunnelProviderProtocol alloc] init];
        protocol.providerBundleIdentifier  = self.vpnConfigurationModel.tunnelBundleId;