1# Input Consumer Error Codes
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3> **NOTE**
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5> This topic describes only module-specific error codes. For details about universal error codes, see [Universal Error Codes](../errorcode-universal.md).
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7## 4200002 Shortcut Key Already Registered by a System Application
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9**Error Message**
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11The hotkey has been used by the system.
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13**Description**
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15This error code is reported if the shortcut key has been registered by a system application.
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17**Possible Cause**
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191. The shortcut key has been registered by a system application.
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21**Solution**
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231. Call **inputConsumer.getAllSystemHotkeys** to query all registered shortcut keys and use any available shortcut keys.
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25## 4200003 Shortcut Key Already Registered by a Third-party Application
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27**Error Message**
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29The hotkey has been subscribed to by another.
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31**Description**
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33This error code is generated when the shortcut key is registered by a third-party application.
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35**Possible Cause**
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371. The shortcut key has been registered by a third-party application.
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39**Solution**
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411. In the cmd window, run **hidumper -s 3101 -a -s** to query all registered shortcut keys and use any available shortcut keys.
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