# CDS Toolbox ct.cube.index\_select fails

**URL:** <https://forum.ecmwf.int/t/cds-toolbox-ct-cube-index-select-fails/1750>\
**Category:** Other - Software and tools\
**Tags:** c3s, toolbox\
**Created:** [25 September 2023 13:13 UTC](https://forum.ecmwf.int/t/cds-toolbox-ct-cube-index-select-fails/1750 "2023-09-25T13:13:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Antonio\_Serrano-dela](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/a/3bc359/32.png) [@Antonio\_Serrano-dela](https://forum.ecmwf.int/u/Antonio_Serrano-dela)\
**Post date:** [25 September 2023 13:13 UTC](https://forum.ecmwf.int/t/cds-toolbox-ct-cube-index-select-fails/1750/1 "2023-09-25T13:13:54Z")

</div>

I cannot find the cause of the error when I use this function. You can find a minimal example [here](https://cds.climate.copernicus.eu/toolbox-editor/398/cerra_time_selection-fails).

Thanks in advance.

It also fails at [the example in the documentation](https://cds.climate.copernicus.eu/toolbox/doc/how-to/16_how_to_select_and_filter_data/16_how_to_select_and_filter_data.html), so I think this is a bug.