If a label fails to create, ShipCelero shows an error message from the carrier. Here are the most common errors and how to fix them.
Carrier credentials invalid or expired
The error message will reference "authentication", "unauthorized", or similar. Go to Settings → Integrations, open the carrier, use Test connection, and re-enter your credentials if the test fails.
Service not available for destination
The selected service does not ship to the destination country, or your carrier account does not have that service enabled. Try a different service, or contact your carrier to enable the route.
Address validation failed
The carrier rejected the address. Check for:
- Incorrect postal code for the city
- Missing house number — for most countries, a street number is required. Exception: UK, Ireland, Isle of Man, Jersey, and Guernsey accept named houses without a number (e.g. "Rose Cottage, High Street") — ShipCelero accepts these automatically.
- Unsupported special characters in the address
- Country mismatch (the country selected does not match the postal code)
Package weight or size exceeded
The package exceeds the carrier's weight or dimension limit for the selected service. Each service has maximum weight limits (typically 20–35 kg) and size restrictions. Check the carrier's documentation or try a different service.
Monthly label limit reached
You have used all included labels for the period. ShipCelero shows a confirmation prompt with the exact price of the extra label — confirm with Create label anyway, or upgrade your plan from the Billing page. On the Free plan, upgrade to continue.
Missing required field
Some carriers require fields that are optional for others (phone number, email, company name). Check the error message for the specific field name and fill it in.