# Unspecified Javascript Error\*\*\*

**URL:** <https://discourse.psychopy.org/t/unspecified-javascript-error/18399>\
**Category:** Online experiments\
**Created:** [November 24, 2020, 9:46pm UTC](https://discourse.psychopy.org/t/unspecified-javascript-error/18399 "2020-11-24T21:46:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![MSLUSKYWPG](https://avatars.discourse-cdn.com/v4/letter/m/3d9bf3/32.png) [@MSLUSKYWPG](https://discourse.psychopy.org/u/MSLUSKYWPG)\
**Post date:** [November 24, 2020, 9:46pm UTC](https://discourse.psychopy.org/t/unspecified-javascript-error/18399/1 "2020-11-24T21:46:21Z")

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URL of experiment: [https://run.pavlovia.org/MSLWPG/ponzo-illusion-study/html/](https://run.pavlovia.org/MSLWPG/ponzo-illusion-study/html/)

Description of the problem: My experiment works perfectly fine in builder, I don’t get any error messages whatsoever when trying to run online. But then I get the classic “unspecified javascript error” and I have absolutely no idea where to start. Any help would be much appreciated.