Undeclared Identifiers in CBPeripheral Delegate

Question

Xcode 9.2 - - Objective C - - Bluno BLE

Hi, I am figuring out a piece of code where I encountered some errors, any help will be much appreciated!

Here is the site with the original code.

Below is an extract of the code from line 224 to line 232:

 if ([service.UUID isEqual:[CBUUID UUIDWithString:CBUUIDGenericAccessProfileString]]) {
    for (CBCharacteristic *aChar in service.characteristics) {
        // Read device name 
        if ([aChar.UUID isEqual:[CBUUID UUIDWithString:CBUUIDDeviceNameString]]) {
            [aPeripheral readValueForCharacteristic:aChar];
            NSLog(@"Found a Device Name Characteristic");
        }
    }
}

When I ran the code, I received these errors:

Use of undeclared identifier 'CBUUIDGenericAccessProfileString'

Use of undeclared identifier 'CBUUIDDeviceNameString'

Is there anything I am missing here? Thanks in advance!