---
page_type: error
code: 81023
message: >-
  81023: Creating an Execution via REST API failed due to malformed contact
  parameters
level: ERROR
product: Studio
---

## 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.