# Slim v2 & v3 Fatal Error Slim\\Helper\\Set.php

**URL:** <https://discourse.slimframework.com/t/slim-v2-v3-fatal-error-slim-helper-set-php/3860>\
**Category:** Questions\
**Created:** [February 13, 2020, 9:35am UTC](https://discourse.slimframework.com/t/slim-v2-v3-fatal-error-slim-helper-set-php/3860 "2020-02-13T09:35:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![BlackBird](https://avatars.discourse-cdn.com/v4/letter/b/b782af/32.png) [@BlackBird](https://discourse.slimframework.com/u/BlackBird)\
**Post date:** [February 13, 2020, 9:35am UTC](https://discourse.slimframework.com/t/slim-v2-v3-fatal-error-slim-helper-set-php/3860/1 "2020-02-13T09:35:59Z")

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Hi, since couple of days I have a strange error which show up from time to time and disappears later.  
Usually after couple of minutes everything is fine again.  
The message is:  
Fatal error in C:\xampp\htdocs\hiabreports\vendor\slim\slim\Slim\Helper\Set.php

Only thing which I changed is that increase performance on xampp server (memory limit 128M, max post size 8M, upload max size 4M)

Honestly I don`t know what to do… what could cause that. My applications works fine for couple of years now…

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**Author:** ![FvsJson](https://avatars.discourse-cdn.com/v4/letter/f/e99b99/32.png) [@FvsJson](https://discourse.slimframework.com/u/FvsJson)\
**Post date:** [February 14, 2020, 9:48am UTC](https://discourse.slimframework.com/t/slim-v2-v3-fatal-error-slim-helper-set-php/3860/2 "2020-02-14T09:48:12Z")

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Please provide the whole stack trace report.

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<div class="post-metadata">

**Author:** ![BlackBird](https://avatars.discourse-cdn.com/v4/letter/b/b782af/32.png) [@BlackBird](https://discourse.slimframework.com/u/BlackBird)\
**Post date:** [February 17, 2020, 1:35pm UTC](https://discourse.slimframework.com/t/slim-v2-v3-fatal-error-slim-helper-set-php/3860/3 "2020-02-17T13:35:36Z")

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[Mon Feb 17 14:14:48.973040 2020] [:error] [pid 2732:tid 1824] [client 134.37.9.220:49884] PHP Fatal error: Class Slim\Helper\Set contains 5 abstract methods and must therefore be declared abstract or implement the remaining methods (ArrayAccess::\xf0:e\x01\x03, ArrayAccess::\xa8\x80h\x01\x03, ArrayAccess::H\x83h\x01\x03, …) in C:\xampp\htdocs\hiquality\vendor\slim\slim\Slim\Helper\Set.php on line 35