# Issue with downloading PanguWeathers's assets

**URL:** <https://forum.ecmwf.int/t/issue-with-downloading-panguweatherss-assets/11834>\
**Category:** C3S - Access and Login\
**Tags:** era5\
**Created:** [11 March 2025 20:45 UTC](https://forum.ecmwf.int/t/issue-with-downloading-panguweatherss-assets/11834 "2025-03-11T20:45:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Zoi\_Tzamtzi](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/z/65b543/32.png) [@Zoi\_Tzamtzi](https://forum.ecmwf.int/u/Zoi_Tzamtzi)\
**Post date:** [11 March 2025 20:45 UTC](https://forum.ecmwf.int/t/issue-with-downloading-panguweatherss-assets/11834/1 "2025-03-11T20:45:49Z")

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I am having trouble downloading the necessary assets for running ai weather forecasting models like PanguWeather. Despite having attained the CDS API key, this is the error I am getting:  
ecmwfapi.api.APIException: “ecmwf.API error 1: User ‘’ has no access to services/mars”  
requests.exceptions.HTTPError: 400 Client Error: Bad Request for url: [https://cds.climate.copernicus.eu/api/retrieve/v1/processes/reanalysis-era5-pressure-levels/execution](https://cds.climate.copernicus.eu/api/retrieve/v1/processes/reanalysis-era5-pressure-levels/execution)  
invalid request  
None of the data you have requested is available yet, please revise the period requested. The latest date available for this dataset is: 2025-03-06 18:00

I am using a simple line of code to request downloading, which what I have found in multiple sites: ai-models --download-assets

I’d be glad if someone could help me out.

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**Author:** ![Emma](https://forum.ecmwf.int/letter_avatar_proxy/v4/letter/e/57b2e6/32.png) [@Emma](https://forum.ecmwf.int/u/Emma)\
**Post date:** [26 March 2025 14:35 UTC](https://forum.ecmwf.int/t/issue-with-downloading-panguweatherss-assets/11834/2 "2025-03-26T14:35:20Z")

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Hi! It looks like you’re running into two **separate issues**.

### 🧩 Problem 1: ECMWF MARS Access Error

> `ecmwfapi.api.APIException: “ecmwf.API error 1: User ‘’ has no access to services/mars”`

This means you’re trying to access ECMWF’s MARS archive using the `ecmwfapi`, but your account doesn’t have permission. Unless you’re from a Member or Co-operating State or a licensed user, you’ll need to use the **CDS API** instead.

To get ERA5 via CDS, use the `cdsapi` with the correct dataset name, e.g.:

- `reanalysis-era5-pressure-levels` → CDS disk subset (fast)
- `reanalysis-era5-complete` → Full MARS archive via CDS API (slower)

Avoid using `ecmwfapi` unless you specifically are approved for MARS access. To discuss access to MARS, you will need to raise a support ticket via the [ECMWF Support Portal](https://support.ecmwf.int).

But if you’re just looking to download **ERA5 data** , stick to **CDS API** instead, and you won’t need MARS access.

### 📅 Invalid Request / Date Out of Range

> `None of the data you have requested is available yet...`

ERA5 data is published with a ~5-day delay. For example, as of today (26-03-2025), the latest available date is **2025-03-21** , so you’ll need to adjust your requests to take the delay into account.

I hope this helps!  
Emma