1# Input Monitor Error Codes 2 3> **NOTE** 4> 5> This topic describes only module-specific error codes. For details about universal error codes, see [Universal Error Codes](../errorcode-universal.md). 6 7## 4100001 Event Listening Not Supported for the Key 8 9**Error Message** 10 11Event listening not supported for the key. 12 13**Description** 14 15This error code is reported if event listening is not supported for this key. 16 17**Possible Causes** 18 19The current API does not support the key for which event listening is to be enabled. 20 21**Solution** 22 23Check whether event listening is supported for the input key. Currently, event listening is supported only for the **META_LEFT**, **META_RIGHT**, power, and volume keys. 24