How to export a table in a geopackage

Question

I'm trying to export a simple PostGIS table loaded in QGIS to a geopackage file.
Here's an example:
options = QgsVectorFileWriter.SaveVectorOptions()
options.driverName = "GPKG"
options.layerName = "_".join(myLayer.name().split(' '))

geo_package = 'my_gpkg.gpkg'

if not os.path.exists(geo_package):
    options.actionOnExistingFile = QgsVectorFileWriter.CreateOrOverwriteFile
else:
    options.actionOnExistingFile = QgsVectorFileWriter.CreateOrOverwriteLayer

res, text = QgsVectorFileWriter.writeAsVectorFormatV2(myLayer, geo_package, QgsCoordinateTransformContext(), options)

if res == QgsVectorFileWriter.NoError:
     print("Successfull export of layer {}".format(myLayer))
else:
    print("Fail error {}:{}".format(res, text))

It works fine for Vector layers but for a simple PostGIS table, I get the Error code 8 with no Error message.

aurel_nc · Accepted Answer

The simple PostGIS table is a table without geometry.
Importing it as is was an error and the layer was not valid.
I wrongly set the datasource in the uri:
uri = QgsDataSourceUri()
uri.setConnection("MyServerAdress", "5432", "myBase", "user", "pass")
uri.setDataSource(schema, table, "geom")
layer = QgsVectorLayer(uri.uri(False), table, "postgres")
QgsProject.instance().addMapLayer(couche)

Altough I should have done this:
uri = QgsDataSourceUri()
uri.setConnection("MyServerAdress", "5432", "myBase", "user", "pass")
uri.setDataSource(schema, table, None)
layer = QgsVectorLayer(uri.uri(False), table, "postgres")
QgsProject.instance().addMapLayer(couche)

I wrote a topic here:Import a table with no geometry

How to export a table in a geopackage

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