# Tegten assertion fail

**URL:** <https://community.freefem.org/t/tegten-assertion-fail/1398>\
**Category:** General Discussion\
**Created:** [December 19, 2021, 7:35am UTC](https://community.freefem.org/t/tegten-assertion-fail/1398 "2021-12-19T07:35:36Z")\
**Posts on this page:** 1\
**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:** [December 19, 2021, 7:35am UTC](https://community.freefem.org/t/tegten-assertion-fail/1398/1 "2021-12-19T07:35:36Z")

</div>

hello,everyone.  
I am building a sphere using mmg and tegten,the error information is like below,

 ![image](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/1X/6ff825e8ac485fba6828cdf20b2d0d553f0feea8.png)  
the code is,  
 ![image](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/1X/459e4972f4011797ef77034f15c8bb1aa74cd66e.png)  
is there anyone can tell me which parameter to correct works?