#Components v2 - SectionBuilder with button — Page 1

Hey everyone. I'm trying to add a ButtonBuilder to a SectionBuilder, nested in a ContainerBuilder. But when trying to post the message, I get an error:

path/node_modules/@discordjs/builders/dist/index.mjs:486
      throw new RangeError("Non-premium buttons must have a label and/or an emoji.");
            ^

RangeError: Non-premium buttons must have a label and/or an emoji.
    at validateRequiredButtonParameters (path/node_modules/@discordjs/builders/dist/index.mjs:486:13)
    at ButtonBuilder.toJSON (path/node_modules/@discordjs/builders/dist/index.mjs:654:5)
    at SectionBuilder.toJSON (path/node_modules/@discordjs/builders/dist/index.mjs:2102:59)       
    at path/src/commands/polls/polls.js:271:34
    at Array.forEach (<anonymous>)
    at Object.action (path/src/commands/polls/polls.js:252:20)

Node.js v20.11.1

I tried to look at an error in my code but I cannot find one.

const container = new ContainerBuilder();

//create button
const buttonId = "polls_" + idx.toString();
const button = createButton(buttonId, field, ButtonStyle.Secondary, emote);
const fieldSection = new SectionBuilder().setButtonAccessory(button);

//line 271
console.log(fieldSection.toJSON());

container.addSectionComponents(fieldSection);
interaction.channel.send({flags: MessageFlags.IsComponentsV2, components: [container]});

//creatButton function:
export const createButton = (id, label, style, emoji) => {
  const button = new ButtonBuilder().setCustomId(id).setStyle(style);
  if (label) button.setLabel(label);
  if (emoji) button.setEmoji(emoji);
  return button;
};

When investigating the Builders, I have this weird accessory in the SectionBuilder:

SectionBuilder {
  data: { type: 9 },
  //components
  accessory: ButtonBuilder {
    data: {
      type: 2,
      data: {
        type: 2,
        emoji: undefined,
        custom_id: 'polls_0',
        style: 2,
        label: 'Choice 1'
      }
    }
  }
}