# Cannot Validate Slot

**URL:** <https://forum.rasa.com/t/cannot-validate-slot/40745>\
**Category:** Rasa Open Source\
**Created:** [March 1, 2021, 2:57pm UTC](https://forum.rasa.com/t/cannot-validate-slot/40745 "2021-03-01T14:57:34Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![alexyuwen](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.rasa.com/alexyuwen/32/13250_2.png) [@alexyuwen](https://forum.rasa.com/u/alexyuwen)\
**Post date:** [March 1, 2021, 6:16pm UTC](https://forum.rasa.com/t/cannot-validate-slot/40745/2 "2021-03-01T18:16:39Z")

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You are currently returning sets rather than dicts since you have used commas instead of colons. Validation actions must return dictionaries.

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_[View the full topic](https://forum.rasa.com/t/cannot-validate-slot/40745)._