# Test function do not exist

**URL:** <https://community.freefem.org/t/test-function-do-not-exist/1315>\
**Category:** General Discussion\
**Created:** [November 9, 2021, 3:11am UTC](https://community.freefem.org/t/test-function-do-not-exist/1315 "2021-11-09T03:11:26Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![xiaojiemo](https://avatars.discourse-cdn.com/v4/letter/x/a4c791/32.png) [@xiaojiemo](https://community.freefem.org/u/xiaojiemo)\
**Post date:** [November 9, 2021, 3:11am UTC](https://community.freefem.org/t/test-function-do-not-exist/1315/1 "2021-11-09T03:11:26Z")

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hello,everyone, I meet a peoblem.  
I am solving a coupled equation.when I put two variables, everything works well. while, after I put the third one, the procedure told me that the test funtion of this variable do not exist. what’s wrong with it?  
I have put the file below.

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<div class="post-metadata">

**Author:** ![xiaojiemo](https://avatars.discourse-cdn.com/v4/letter/x/a4c791/32.png) [@xiaojiemo](https://community.freefem.org/u/xiaojiemo)\
**Post date:** [November 9, 2021, 3:12am UTC](https://community.freefem.org/t/test-function-do-not-exist/1315/2 "2021-11-09T03:12:14Z")

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[test+p.txt.log](https://community.freefem.org/uploads/short-url/pyk3KlvvnXjvcs7SY9j1DFrjpl4.log) (16.5 KB)