I try to -basically- answer this from the dialog that we had in the comments:
IBM Notes / Domino is a Client- Server solution where IBM Domino is the server and IBM Notes is the client.
Usually you work with the client and connect to the server that is on another machine.
Notes client is -by default- installed in C:\Program Files (x86)\IBM\Notes and the Data- directory (containing the personal addressbook of the user named names.nsf, the bookmarks and desktop and the client log.nsf) is in C:\Program Files (x86)\IBM\Notes\Data (ignoring multiuser setup on purpose as it makes things to complicated).
A Domino server is -again by default- installed in C:\Program Files (x86)\IBM\Domino, its data directory is in C:\Program Files (x86)\IBM\Domino\Data.
There is a names.nsf and a log.nsf there as well, but names.nsf is the Domino Directory of the server and log.nsf the log of... you guess.
Now one can of course install Notes and Domino on the same machine, but still they are two distinct programs.
To access Databases from a Domino server, you NEVER access them directly via file system but use the Open- Dialog to open them from the server.
If you want to access the files via admin- client (that can be installed along with the Notes Client), then you select "Open Server" from the File- Menu to access it. AGAIN: Don't access server files "directly" although they are on the same machine.
When creating new databases (from client or admin) select the Server to create them, NOT "Local".
What is the problem with the question: You created a database in the Data- directory of the client. The server does NOT know of this database as it has its own Data- directory. it will show the message you wrote.
Create it in the Data- Directory of the server instead then it will work.
Of course one could just copy the database from Notes\Data to Domino\Data.
But this will -by default- not work either: Out of the box the Notes Client encrypts every local database with the user's ID file. When copied over to Domino the server will not be able to read it. You need to decrypt to database before copy, you can do that in the properties of the database.
All together seems, that you need a training for whatever you try to do, otherwise this question will be your least problem.