# RuntimeError: tex could not be resolved

**URL:** <https://talk.observablehq.com/t/runtimeerror-tex-could-not-be-resolved/2182>\
**Category:** Uncategorized\
**Created:** [July 18, 2019, 5:18pm UTC](https://talk.observablehq.com/t/runtimeerror-tex-could-not-be-resolved/2182 "2019-07-18T17:18:51Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![nicola](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/nicola/32/1039_2.png) [@nicola](https://talk.observablehq.com/u/nicola)\
**Post date:** [July 18, 2019, 5:18pm UTC](https://talk.observablehq.com/t/runtimeerror-tex-could-not-be-resolved/2182/1 "2019-07-18T17:18:51Z")

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Should tex be default or do I need to import?

In my observable I get an annoying `RuntimeError: tex could not be resolved` which does not render my observable…

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**Author:** ![bgchen](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/bgchen/32/784_2.png) [@bgchen](https://talk.observablehq.com/u/bgchen)\
**Post date:** [July 18, 2019, 5:22pm UTC](https://talk.observablehq.com/t/runtimeerror-tex-could-not-be-resolved/2182/2 "2019-07-18T17:22:15Z")

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[`tex` is part of the Observable standard library](https://observablehq.com/@observablehq/standard-library), so it should be there by default. Mind sharing a link to the notebook where you’re seeing problems?

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**Author:** ![nicola](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/nicola/32/1039_2.png) [@nicola](https://talk.observablehq.com/u/nicola)\
**Post date:** [July 18, 2019, 5:33pm UTC](https://talk.observablehq.com/t/runtimeerror-tex-could-not-be-resolved/2182/3 "2019-07-18T17:33:01Z")

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Ok apparently only Firefox when I am logged in, tex fails, if I open it in incognito mode, then it’s all good.

It’s pretty annoying since I can’t replicate it

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**Author:** ![bgchen](https://yyz2.discourse-cdn.com/flex030/user_avatar/talk.observablehq.com/bgchen/32/784_2.png) [@bgchen](https://talk.observablehq.com/u/bgchen)\
**Post date:** [July 18, 2019, 5:36pm UTC](https://talk.observablehq.com/t/runtimeerror-tex-could-not-be-resolved/2182/4 "2019-07-18T17:36:35Z")

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Strange, as I have been using `tex` in Firefox today while logged-in without seeing any issues. Could it be a privacy or ad-blocking extension? Do you see any errors in your browser’s dev console?