# Intermediate Fetching. Asynchronous fetching

**URL:** <https://forums.kodeco.com/t/intermediate-fetching-asynchronous-fetching/116242>\
**Category:** Core Data by Tutorials\
**Created:** [July 29, 2020, 9:57pm UTC](https://forums.kodeco.com/t/intermediate-fetching-asynchronous-fetching/116242 "2020-07-29T21:57:07Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![pegs](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/pegs/32/81494_2.png) [@pegs](https://forums.kodeco.com/u/pegs)\
**Post date:** [July 29, 2020, 9:57pm UTC](https://forums.kodeco.com/t/intermediate-fetching-asynchronous-fetching/116242/1 "2020-07-29T21:57:07Z")

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I am download [https://store.raywenderlich.com/products/core-data-by-tutorials-source-code](https://store.raywenderlich.com/products/core-data-by-tutorials-source-code). Open “04-04-intermediate-fetching” → final → BubbleTeaFinder And necessarily add scheme “-com.apple.CoreData.ConcurrencyDebug 1”, and run the projec  
I don’t now why project crash if you turn on scheme

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**Author:** ![syedfa](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/syedfa/32/101500_2.png) [@syedfa](https://forums.kodeco.com/u/syedfa)\
**Post date:** [September 30, 2020, 7:31am UTC](https://forums.kodeco.com/t/intermediate-fetching-asynchronous-fetching/116242/2 "2020-09-30T07:31:10Z")

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@pegs Thanks very much for your question!

Can you please share your code that you’re using, and which is causing the crash? Can you also show us the error message that you’re getting?

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**Author:** ![pegs](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/pegs/32/81494_2.png) [@pegs](https://forums.kodeco.com/u/pegs)\
**Post date:** [September 30, 2020, 10:58am UTC](https://forums.kodeco.com/t/intermediate-fetching-asynchronous-fetching/116242/3 "2020-09-30T10:58:56Z")

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@syedfa  
Thank for your reply, but i was get feedback in stackOverflow

> <https://stackoverflow.com/questions/63192381/why-does-the-raywenderlich-code-break-if-you-enable-the-scheme-com-apple-core>

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**Author:** ![ravikirankhareedi](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/ravikirankhareedi/32/81494_2.png) [@ravikirankhareedi](https://forums.kodeco.com/u/ravikirankhareedi)\
**Post date:** [October 27, 2020, 6:41am UTC](https://forums.kodeco.com/t/intermediate-fetching-asynchronous-fetching/116242/4 "2020-10-27T06:41:23Z")

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Does the book cover concurrency in Coredata?

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**Author:** ![system](https://s3.amazonaws.com/cdn.raywenderlich.com/community/forum-assets/noun-game-ghost-878668.png) [@system](https://forums.kodeco.com/u/system)\
**Post date:** [January 12, 2021, 1:57pm UTC](https://forums.kodeco.com/t/intermediate-fetching-asynchronous-fetching/116242/5 "2021-01-12T13:57:07Z")

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