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1xxx — Client Errors

1004: Invalid message content

1004: Invalid message content

The message content or parts array is invalid.

The message content or parts array is invalid. This is an HTTP 400 error indicating the message you are trying to send has an invalid structure.

Troubleshooting

Ensure the parts array contains valid text, media, or link parts
A link part must be the only part in the message — it cannot be combined with other parts