---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/81023#article
headline: "81023: Creating an Execution via REST API failed due to malformed contact parameters"
url: https://www.twilio.com/docs/api/errors/81023
inLanguage: en
dateModified: 2026-03-11T22:03:37.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 81023: Creating an Execution via REST API failed due to malformed contact parameters

Log Type: APPLICATION

Log Level: ERROR

## Description

The Create Execution endpoint was called with To and/or From parameters that could not be processed.

### Possible causes

* Collectively, the To and From parameters exceeded 300 bytes.

### Possible solutions

Double-check the provided To and From parameters for syntax errors.