An I/O error occurred while sending to the backend postgresql

Question

Just so you understand my case: Recently I was trying to install plpython3u on postgresql 15, and with a lot of struggle I managed I set the python environment variables (both for system and user) and I also set the environment variables requested on this site: ADB Docs

So to run the plpython3u function I did:

CREATE EXTENSION IF NOT EXISTS plpython3u;

CREATE OR REPLACE FUNCTION saudacao_simples()
RETURNS TEXT AS $$
  mensagem = 'Olá, mundo!'
  return mensagem
$$ LANGUAGE plpython3u;

the extension is installed successfully, but my function does not run, why? I get the error:

java.net.SocketException: Connection reset
An I/O error occurred while sending to the backend.
at java.base/sun.nio.ch.NioSocketImpl.implRead(Unknown Source)
at java.base/sun.nio.ch.NioSocketImpl.read(Unknown Source)
at java.base/sun.nio.ch.NioSocketImpl$1.read(Unknown Source)
at java.base/java.net.Socket$SocketInputStream.read(Unknown Source)
at org.postgresql.core.VisibleBufferedInputStream.readMore(VisibleBufferedInputStream.java:161)
at org.postgresql.core.VisibleBufferedInputStream.ensureBytes(VisibleBufferedInputStream.java:128)
at org.postgresql.core.VisibleBufferedInputStream.ensureBytes(VisibleBufferedInputStream.java:113)
at org.postgresql.core.VisibleBufferedInputStream.read(VisibleBufferedInputStream.java:73)
at org.postgresql.core.PGStream.receiveChar(PGStream.java:453)
at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:2120)
at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:356)
at org.postgresql.jdbc.PgStatement.executeInternal(PgStatement.java:496)
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:413)
at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:333)
at org.postgresql.jdbc.PgStatement.executeCachedSql(PgStatement.java:319)
at org.postgresql.jdbc.PgStatement.executeWithFlags(PgStatement.java:295)
at org.postgresql.jdbc.PgStatement.execute(PgStatement.java:290)
at org.jkiss.dbeaver.model.impl.jdbc.exec.JDBCStatementImpl.execute(JDBCStatementImpl.java:330)
at org.jkiss.dbeaver.model.impl.jdbc.exec.JDBCStatementImpl.executeStatement(JDBCStatementImpl.java:131)
at org.jkiss.dbeaver.ui.editors.sql.execute.SQLQueryJob.executeStatement(SQLQueryJob.java:600)
at org.jkiss.dbeaver.ui.editors.sql.execute.SQLQueryJob.lambda$2(SQLQueryJob.java:503)
at org.jkiss.dbeaver.model.exec.DBExecUtils.tryExecuteRecover(DBExecUtils.java:190)
at org.jkiss.dbeaver.ui.editors.sql.execute.SQLQueryJob.executeSingleQuery(SQLQueryJob.java:510)
at org.jkiss.dbeaver.ui.editors.sql.execute.SQLQueryJob.extractData(SQLQueryJob.java:962)
at org.jkiss.dbeaver.ui.editors.sql.SQLEditor$QueryResultsContainer.readData(SQLEditor.java:4130)
at org.jkiss.dbeaver.ui.controls.resultset.ResultSetJobDataRead.lambda$0(ResultSetJobDataRead.java:123)
at org.jkiss.dbeaver.model.exec.DBExecUtils.tryExecuteRecover(DBExecUtils.java:190)
at org.jkiss.dbeaver.ui.controls.resultset.ResultSetJobDataRead.run(ResultSetJobDataRead.java:121)
at org.jkiss.dbeaver.ui.controls.resultset.ResultSetViewer$ResultSetDataPumpJob.run(ResultSetViewer.java:5148)
at org.jkiss.dbeaver.model.runtime.AbstractJob.run(AbstractJob.java:105)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

I tried reinstalling the plpython extension, restarting postgresql and I also tried reestablishing new connections, but nothing helped