# Custom Keyword java.lang.ClassNotFoundException

**URL:** <https://forum.katalon.com/t/custom-keyword-java-lang-classnotfoundexception/32264>\
**Category:** Web Testing\
**Tags:** katalon-studio\
**Created:** [August 28, 2019, 12:23pm UTC](https://forum.katalon.com/t/custom-keyword-java-lang-classnotfoundexception/32264 "2019-08-28T12:23:23Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![HeleneB](https://dub1.discourse-cdn.com/katalon/user_avatar/forum.katalon.com/heleneb/32/2775_2.png) [@HeleneB](https://forum.katalon.com/u/HeleneB)\
**Post date:** [August 28, 2019, 1:47pm UTC](https://forum.katalon.com/t/custom-keyword-java-lang-classnotfoundexception/32264/4 "2019-08-28T13:47:25Z")

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In your TestCase, did you escape the `\` ?  
You have to use `C:\\Users\\username\\...`

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