# S10008 {#S10008}

## Error Code {#error_code .section}

S10008

## Error Message {#error_message .section}

`keyColumn must be a string or a string vector indicating the name of the key columns. RefId: S10008`

## Probable Causes {#probable_causes .section}

This error occurs when the *keyColumn* parameter of the `createDeviceEngine` function is invalid.

**Note**: *keyColumn* must be a STRING scalar/vector corresponding to one or more column names in the input table.

## Solutions {#solutions .section}

Use a valid *keyColumn* parameter.

**Parent topic:**[Error Code Reference](../../Troubleshooting/ErrorCode.md)

