NRF51_DK_OTA bulding problems

Hi!

I’m developing a application in MBED STUDIO. I’m trying to implement the FOTA service.
When I compile the code in mbed studio for the NRF51_DK_OTA I get this error:
[Fatal Error] Gap.h@34,10: ‘BleImplementationForward.h’ file not found

[ERROR] In file included from .\mbed-os\features\FEATURE_BLE\source\BLE.cpp:18:

In file included from ./mbed-os/features/FEATURE_BLE\ble/BLE.h:23:

./mbed-os/features/FEATURE_BLE\ble/Gap.h:34:10: fatal error: ‘BleImplementationForward.h’ file not found

#include “BleImplementationForward.h”