Whenever i add header file of Conectivity( specially buletooth classes), then there is no error on including it. But when i create any of objects of these classes then the following error came.

error: 'QBluetoothAddress' does not name a type
on fallowing line
QBluetoothAddress obj;

where as #include <QBluetoothAddress> is also there.

in project file i had also wrote the following code.

CONFIG += mobility
MOBILITY += connectivity

Please help me to sort out this issue.
Thanks in advance