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Error: "PB Shipping API: 1050001Invalid label paper size;1050002Invalid label receipt option for given paper size" in SendPro Enterprise

Learn how to resolve the issue "PB Shipping API: 1050001Invalid label paper size;1050002Invalid label receipt option for given paper size" when Shipping with carrier PB Shipping API, First Class Mail, with package type Large Envelope/Flat.
Products affected: SendPro® Enterprise

Issue

When you try to ship a large envelope or flat package using the PB Shipping API with First Class Mail, you might see this error: "PB Shipping API: 1050001Invalid label paper size;1050002Invalid label receipt option for given paper size."

Cause

This error shows up because the wrong package type was chosen.

Resolution

  1. Open the Shipping app.
  2. Find the Package Type menu.
  3. Change the option from Large Envelope/Flat to First Class Large Envelope/Flat.

UPDATED: March 26, 2025