E15008 — WhatsAppTemplateComponentsInvalid

The language's components are not a valid template document.

• HTTP status: 422
• Type: validation_error
• Name: WhatsAppTemplateComponentsInvalid

What to do

The blocks are arranged in a way WhatsApp does not accept. Saving a draft refuses only the structural problems. A language carries at most one block of each type, and a format belongs only on a header block, which must carry one this API accepts. The rest are checked when you submit: every card in a carousel carries the same blocks in the same order, each card needs a header, a coupon button needs its sample code, and an authentication template carries no copy of its own because WhatsApp writes it. The response names the block at fault.

Related

• E15xxx — WhatsApp sending & delivery: every code in this range
• Errors: the full wire contract, status mapping, and error catalog
• Error handling: branching on type and code, validation details, and vendor_code