Error 0x80EE004F

Value: -2131886001 | 0x80EE004F | 2163081295

What does it mean ?

RTC_E_INVALID_BUDDY_LIST  
Buddy list is invalid
Value: 79 | 0x004F | 0b0000000001001111

Where does it come from ?

FACILITY_RTC_INTERFACE  
RTC - Real-time Communications
Value: 238 | 0x0EE | 0b11101110

Other Errors for FACILITY_RTC_INTERFACE