Error creating function stub for advapi32!RegOpenKeyExW.

I was trying to analyse a sample with Cuckoo Sandbox 2.0.7 and the analyzer logs shows:
`
2019-11-06 13:14:21,000 [analyzer] CRITICAL: Error creating function stub for advapi32!RegCloseKey.
`
`
2019-11-06 13:14:21,015 [analyzer] CRITICAL: Error creating function stub for advapi32!RegOpenKeyExW.
`
I would like to know what causes such an error and is there anyway I can attempt to fix it?