# Playground does not execute on first chapter

**URL:** <https://forums.kodeco.com/t/playground-does-not-execute-on-first-chapter/41341>\
**Category:** RxSwift\
**Created:** [April 7, 2018, 3:39pm UTC](https://forums.kodeco.com/t/playground-does-not-execute-on-first-chapter/41341 "2018-04-07T15:39:49Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![dkoenig82](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/dkoenig82/32/102000_2.png) [@dkoenig82](https://forums.kodeco.com/u/dkoenig82)\
**Post date:** [April 25, 2018, 2:21pm UTC](https://forums.kodeco.com/t/playground-does-not-execute-on-first-chapter/41341/12 "2018-04-25T14:21:59Z")

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Hello,

i have very bad troubles with the source code for the RxSwift Book!?  
Please can anyone update the source Code?

The playground for chapter Two(Observable) and chapter three(subjects) does not work!?

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