---
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headline: "45731: Pre-engagement data too large. "
url: https://www.twilio.com/docs/api/errors/45731
inLanguage: en
dateModified: 2026-05-05T17:40:20.000Z
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  name: Twilio Developer Education Team
publisher:
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  name: Twilio
---

# 45731: Pre-engagement data too large. 

Log Type: APPLICATION

Log Level: ERROR

## Description

Failed to create webchat conversation. Pre-engagement data too large.

### Possible causes

Pre engagment data is over the maximum allowed size of 16KB.

### Possible solutions

Ensure pre-engagement data is less than 16KB.

Read more about creating valid attributes [here.](/docs/conversations-classic/attributes)