# I have an error saying: Cannot read properties of undefined (reading 'iface')

**URL:** <https://forum.makecode.com/t/i-have-an-error-saying-cannot-read-properties-of-undefined-reading-iface/18687>\
**Category:** Help\
**Created:** [March 22, 2023, 8:22pm UTC](https://forum.makecode.com/t/i-have-an-error-saying-cannot-read-properties-of-undefined-reading-iface/18687 "2023-03-22T20:22:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mineninja77777](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/mineninja77777/32/8130_2.png) [@mineninja77777](https://forum.makecode.com/u/mineninja77777)\
**Post date:** [March 22, 2023, 8:22pm UTC](https://forum.makecode.com/t/i-have-an-error-saying-cannot-read-properties-of-undefined-reading-iface/18687/1 "2023-03-22T20:22:09Z")

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[https://github.com/Unexian/big-alchemy](https://github.com/Unexian/big-alchemy) is the code though it might be fixed by the time you see this

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<div class="post-metadata">

**Author:** ![mineninja77777](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/mineninja77777/32/8130_2.png) [@mineninja77777](https://forum.makecode.com/u/mineninja77777)\
**Post date:** [March 30, 2023, 3:56pm UTC](https://forum.makecode.com/t/i-have-an-error-saying-cannot-read-properties-of-undefined-reading-iface/18687/2 "2023-03-30T15:56:06Z")

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Solved now