nov. 16, 2020 6:43:54 DA TARDE com.orientechnologies.common.log.OLogManager log INFO: Detected limit of amount of simultaneously open files is 1048576, limit of open files for disk cache will be set to 523776 Exception in thread "main" com.orientechnologies.orient.core.exception.ODatabaseException: Cannot open database 'demodb'

OrientDB Version: <3.1.4>

Java Version: <Java 14 openjdk-amd64>

OS: <ubuntu 20.04>

Expected behavior

Actual behavior

Hello,
(I am new at this)
I have this error, on Eclipse, with openjdk:

nov. 16, 2020 6:08:24 DA TARDE com.orientechnologies.common.log.OLogManager log
INFO: Detected limit of amount of simultaneously open files is 1048576,  limit of open files for disk cache will be set to 523776
Exception in thread "main" com.orientechnologies.orient.core.exception.ODatabaseException: Cannot open database 'rui'
	at com.orientechnologies.orient.core.db.OrientDBRemote.open(OrientDBRemote.java:113)
	at com.orientechnologies.orient.core.db.OrientDB.open(OrientDB.java:224)
	at com.orientechnologies.orient.core.db.OrientDB.open(OrientDB.java:210)
	at root.rui.LigaOrientDB.main(LigaOrientDB.java:13)
Caused by: com.orientechnologies.orient.core.exception.OStorageException: Cannot create a connection to remote server address(es): [ruin:2480]
	DB name="rui"
	at com.orientechnologies.orient.client.remote.OStorageRemote.openRemoteDatabase(OStorageRemote.java:1906)
	at com.orientechnologies.orient.client.remote.OStorageRemote.openRemoteDatabase(OStorageRemote.java:1750)
	at com.orientechnologies.orient.client.remote.OStorageRemote.open(OStorageRemote.java:570)
	at com.orientechnologies.orient.core.db.document.ODatabaseDocumentRemote.internalOpen(ODatabaseDocumentRemote.java:235)
	at com.orientechnologies.orient.core.db.OrientDBRemote.open(OrientDBRemote.java:110)
	... 3 more

With a simple class to learn OrinetDB:

`package root.rui;

import com.orientechnologies.orient.core.db.ODatabaseSession;
import com.orientechnologies.orient.core.db.OrientDB;
import com.orientechnologies.orient.core.db.OrientDBConfig;

public class LigaOrientDB {

public static void main(String[] args) {
	// TODO Auto-generated method stub
	//OrientDB o =new OrientDB("remote:192.168.1.64:2480", OrientDBConfig.defaultConfig() );
	//OrientDB o =new OrientDB("remote:localhost:2480", OrientDBConfig.defaultConfig() );
	OrientDB o =new OrientDB("remote:ruin:2480", OrientDBConfig.defaultConfig() );
	ODatabaseSession s = o.open("rui", "admin","admin" );
	if (s.getClass("Pessoa") == null )   { s.createVertexClass("Pessoa" ) ; }
	if (s.getClass("AmigoDe" ) == null ) { s.createEdgeClass("AmigoDe") ; }
	s.close();
	o.close();
}

}
`
Can anyone tell me, what I am doing wrong?
Thank's in advance.

Steps to reproduce

nov. 16, 2020 6:43:54 DA TARDE com.orientechnologies.common.log.OLogManager log
INFO: Detected limit of amount of simultaneously open files is 1048576, limit of open files for disk cache will be set to 523776
Exception in thread "main" com.orientechnologies.orient.core.exception.ODatabaseException: Cannot open database 'demodb'