# Operation error in problem definition

**URL:** <https://community.freefem.org/t/operation-error-in-problem-definition/466>\
**Category:** General Discussion\
**Created:** [June 13, 2020, 1:50pm UTC](https://community.freefem.org/t/operation-error-in-problem-definition/466 "2020-06-13T13:50:31Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![sumantkr](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/sumantkr/32/2681_2.png) [@sumantkr](https://community.freefem.org/u/sumantkr)\
**Post date:** [June 13, 2020, 4:35pm UTC](https://community.freefem.org/t/operation-error-in-problem-definition/466/5 "2020-06-13T16:35:24Z")

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Thanks @prj  
I was looking for such examples with coding.

- It has quality contents and helpful for me.

I’ll inform you after getting my code fixed with my model equation.

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