---
page_type: error
code: 45601
message: "45601: Custom Flex UI error"
level: ERROR
product: Flex
---

## Description

Error thrown by a user's custom code/plugin.

### Possible Causes

- Custom code has been written to throw and report a Flex error event

### Possible Solutions

- Fix custom code so that the error is not thrown
- Remove code which throws and reports a custom Flex error event