1# Screen Hopping 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## 20900001 Input Device Operation Failed 8 9**Error Message** 10 11Service exception. Possible causes: 1. A system error, such as null pointer, container-related exception, or IPC exception. 2. N-API invocation exception or invalid N-API status. 12 13**Description** 14 15This error code is reported if the screen hopping status is abnormal when the screen hopping API is called. 16 17**Possible Causes** 18 191. When screen hopping is initiated, the local device is in the hopped state. 202. When screen hopping is disabled, the local device is in the free state. 213. When screen hopping is disabled, the local device is in the hopping state. 224. A system error (for example, null pointer, container exception, or IPC exception) has occurred. 235. The native API call is abnormal, or the native API status is invalid. 24 25**Procedure** 26 271. When initiating screen hopping, make sure that the local device is not in the hopped state. 282. When disabling screen hopping, make sure that the local device is not in the free state. 293. When disabling screen hopping, make sure that the local device is not in the hopping state. 30