Could not perform backup protocol version exchange, error code -6

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd&quot;&gt;


DLMessageProcessMessage SupportedProtocolVersions 2.000000 2.100000 MessageName Hello

16:41:18 property_list_service.c:227 internal_plist_receive_timeout(): initial read=4
16:41:18 property_list_service.c:236 internal_plist_receive_timeout(): 176 bytes following
16:41:18 property_list_service.c:245 internal_plist_receive_timeout(): received 176 bytes
16:41:18 property_list_service.c:259 internal_plist_receive_timeout(): printing 434 bytes plist:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd&quot;&gt;


DLMessageProcessMessage ErrorCode 1 ErrorDescription No common supported protocol version MessageName Response

Could not perform backup protocol version exchange, error code -6
16:41:18 lockdown.c:185 lockdownd_stop_session(): stopping session