Error 0x88010007

Value: -2013200377 | 0x88010007 | 2281766919

What does it mean ?

WEP_E_OS_NOT_PROTECTED  
The operating system drive is not protected by 3rd party drive encryption.
Value: 7 | 0x0007 | 0b0000000000000111

Where does it come from ?

FACILITY_WEP  
WEP Encryption (Wired Equivalent Privacy)
Value: 2049 | 0x801 | 0b100000000001

Other Errors for FACILITY_WEP