Postgres: ERROR: operator does not exist: point  point
Possible explanation: you installed the extension in a schema that's missing from your current search_path.

Diagnose with:

SELECT extname, extnamespace::regnamespace FROM pg_extension
WHERE  extname IN ('cube', 'earthdistance');

SHOW search_path;


Is the schema of the extensions in your current search_path? If not, there is your explanation. Either install to a different schema or adapt your search_path.

And:

SELECT oprnamespace::regnamespace, oprleft::regtype, oprname, oprright::regtype
FROM   pg_operator
WHERE  oprname = '&lt;@&gt;';


Related:


Is it recommended to install extensions into pg_catalog schema?
How does the search_path influence identifier resolution and the “current schema”