Error 0x8065000F

Value: -2140864497 | 0x8065000F | 2154102799

What does it mean ?

E_BLUETOOTH_ATT_INSUFFICIENT_ENCRYPTION  
The attribute requires encryption before it can be read or written.
Value: 15 | 0x000F | 0b0000000000001111

Where does it come from ?

FACILITY_BLUETOOTH_ATT  
Bluetooth ATT (Attribute Protocol)
Value: 101 | 0x065 | 0b01100101

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