# Builder-only experiment throws "ReferenceError: Rect is not defined" on Pavlovia

**URL:** <https://discourse.psychopy.org/t/builder-only-experiment-throws-referenceerror-rect-is-not-defined-on-pavlovia/5857>\
**Category:** Online experiments\
**Tags:** notdefined\
**Created:** [November 17, 2018, 4:11pm UTC](https://discourse.psychopy.org/t/builder-only-experiment-throws-referenceerror-rect-is-not-defined-on-pavlovia/5857 "2018-11-17T16:11:26Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![tsgouvea](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.psychopy.org/tsgouvea/32/4983_2.png) [@tsgouvea](https://discourse.psychopy.org/u/tsgouvea)\
**Post date:** [May 1, 2019, 3:55pm UTC](https://discourse.psychopy.org/t/builder-only-experiment-throws-referenceerror-rect-is-not-defined-on-pavlovia/5857/11 "2019-05-01T15:55:59Z")

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[see other comment [here](https://discourse.psychopy.org/t/referenceerror-position-is-not-defined/7473/5)]

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_[View the full topic](https://discourse.psychopy.org/t/builder-only-experiment-throws-referenceerror-rect-is-not-defined-on-pavlovia/5857)._