Cannot insert object type "Attachment", error "TypeError: mime.lookup is not a function"

[Swiftnesses]

I'm trying to insert an 'Attachment' to a record, the error returned by the dml node is:
"TypeError: mime.lookup is not a function"

Sample code:

msg.payload = {
    "ParentId": "a1d790000008vDcAAI",
    "Name": "hello.txt",
    "Body": "SGVsbG8u",
    "ContentType": "text/plain"
}

return msg