If you get this message:
and the log file HackoladeRE.log in C:\Users%userprofile%\AppData\Roaming\HackoladeLogs shows the error "message": "An unknown N1QL error occured. This is usually related to an out-of-memory condition."
There's a workaround for this Couchbase issue. In Hackolade go to Tools > Options > Reverse-Engineering and enable Query Pagination.
The pagination parameter is a fine balance... If too high, and you get that same error. If too low, and the reverse-engineering process will be slower.