# Error in Example - Build with Python

**URL:** <https://forum.algorand.co/t/error-in-example-build-with-python/6048>\
**Category:** General\
**Created:** [February 17, 2022, 3:41pm UTC](https://forum.algorand.co/t/error-in-example-build-with-python/6048 "2022-02-17T15:41:03Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![fabrice](https://avatars.discourse-cdn.com/v4/letter/f/5fc32e/32.png) [@fabrice](https://forum.algorand.co/u/fabrice)\
**Post date:** [February 17, 2022, 6:09pm UTC](https://forum.algorand.co/t/error-in-example-build-with-python/6048/5 "2022-02-17T18:09:01Z")

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In that case, most likely sandbox is not running properly.

Have you successfully run the step [Build with Python - Algorand Developer Portal](https://developer.algorand.org/docs/get-started/dapps/pyteal/#install-sandbox)?

See also this thread [Sandbox fails to complete initialization on testnet -- it doesn't even try to "fast-catchup." Can anybody help? - #2 by fabrice](https://forum.algorand.co/t/sandbox-fails-to-complete-initialization-on-testnet-it-doesnt-even-try-to-fast-catchup-can-anybody-help/5800/2) or any other post on forum that may talk about sandbox issues.

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