Error 0x802A010A

Value: -2144730870 | 0x802A010A | 2150236426

What does it mean ?

UI_E_TIMER_CLIENT_ALREADY_CONNECTED  
This client is already connected to a timer.
Value: 266 | 0x010A | 0b0000000100001010

Where does it come from ?

FACILITY_UI  
User Interface
Value: 42 | 0x02A | 0b00101010

Other Errors for FACILITY_UI