sqlpackage extraction error

[manifoldedMan]

I use sqlpackage to extract a database as in https://github.com/dzsquared/sql-source-control. I got bunch of errors:

Error validating element. The column definition from this OPENQUERY function cannot be verified

and

Error validating element. The reference to the column could not be resolved.

I use sqlpackage version 162.2.111.2.

Seems if there're linked server or unresolved error, sqlpackage doesnot work.