# How ro run daml sandbox in Development server

**URL:** <https://forum.canton.network/t/how-ro-run-daml-sandbox-in-development-server/4718>\
**Category:** App Development\
**Tags:** features and bugs\
**Created:** [June 13, 2022, 2:39pm UTC](https://forum.canton.network/t/how-ro-run-daml-sandbox-in-development-server/4718 "2022-06-13T14:39:10Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![stefanobaghino-da](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/stefanobaghino-da/32/7057_2.png) [@stefanobaghino-da](https://forum.canton.network/u/stefanobaghino-da)\
**Post date:** [June 14, 2022, 6:57am UTC](https://forum.canton.network/t/how-ro-run-daml-sandbox-in-development-server/4718/2 "2022-06-14T06:57:56Z")

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Hi @Sarah_Caloobanan. That’s not an error, it’s just a warning. By default, contract ID generation uses a secure random number generator that needs proper initialization. The warning is just a recommendation not to use this on continuous integration servers to avoid slowing down integration tests when starting up the sandbox. You can safely ignore the warning when developing locally.

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