Column Modified by cannot be loaded (400) The query to field 'Editor' is not valid.

[jakprovaznik1]

I am using this syntax:

return sprLib
.list({
name: this.config.answers,
baseUrl: this.state.queryBaseUrl
})
.items({
listCols: {
dataObjectID: { dataName: "Id" },
status: { dataName: "STATUS" },
notes: { dataName: "NOTES" },
lastModifiedAt: { dataName: "Modified" },
modifiedBy: { dataName: "Editor"}
},
queryFilter:
"Title eq '" + queryString.parse(this.props.location.search).bid + "'"
})

This is in the error message: The $select query string must specify the target fields and the $expand query string must contains Editor

How can I use expand parameter in this case?