QGIS -Split vector layer tool not generating an output

I’m trying to split a vector layer into new layers based on one field. The field is string type but when I run the tool, a message saying ‘Creation of field fid failed (OGR error: Wrong field type for fid)’ comes up. Before running I created a folder to store the output layers.

Any idea about what I have to change or what the right type field is, please?

The output should be many layers as unique values the field have.