Send Email on Click Error

Hello, It's a few days that a very simple click to send email function gives me a "Invalid parameter: html ("undefined")" error.

let myEmail := "11111111@gmail.com";

importFile(this, printAndSaveRecord(this, "RECEIPT"), "RECEIPT2.pdf");

sendEmail({

from: myEmail,

to: "11111111111@lon1.printnode.com",

subject: "PRINT",

text: "PRINT",

attachments: file(this, "RECEIPT2.pdf")

});

let r := closeRecord();

r

Any ideas on why this is happening??

Thanks!