# "reference to undefined label" error during compilation

**URL:** <https://forum.algorand.co/t/reference-to-undefined-label-error-during-compilation/3943>\
**Category:** General\
**Tags:** teal\
**Created:** [August 4, 2021, 11:57pm UTC](https://forum.algorand.co/t/reference-to-undefined-label-error-during-compilation/3943 "2021-08-04T23:57:20Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![Maugli](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.algorand.co/maugli/32/907_2.png) [@Maugli](https://forum.algorand.co/u/Maugli)\
**Post date:** [August 5, 2021, 7:44am UTC](https://forum.algorand.co/t/reference-to-undefined-label-error-during-compilation/3943/2 "2021-08-05T07:44:28Z")

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> [@xonack](#):
>
> `bnz valid_arg:`

instead, write `bnz valid_arg`

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