# CHT v2 Error

**URL:** <https://www.simscale.com/forum/t/cht-v2-error/92003>\
**Category:** Project Support\
**Created:** [December 31, 2020, 1:25pm UTC](https://www.simscale.com/forum/t/cht-v2-error/92003 "2020-12-31T13:25:14Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ykho](https://www.simscale.com/forum/user_avatar/www.simscale.com/ykho/32/13307_2.png) [@ykho](https://www.simscale.com/forum/u/ykho)\
**Post date:** [December 31, 2020, 1:25pm UTC](https://www.simscale.com/forum/t/cht-v2-error/92003/1 "2020-12-31T13:25:14Z")

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Dear Richard,

I am trying to do the “Natural Convection of a LED Spotlight” using the CHT v2.0 solver, but I got this error message:

 ![image](https://www.simscale.com/forum/uploads/default/original/3X/8/c/8c4412916302f9bdc23ababf0f79c986907e3727.png)

Could you give some help with that? Thank you very much!

BR!

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**Author:** ![Ricardopg](https://www.simscale.com/forum/user_avatar/www.simscale.com/ricardopg/32/26909_2.png) [@Ricardopg](https://www.simscale.com/forum/u/Ricardopg)\
**Post date:** [December 31, 2020, 3:01pm UTC](https://www.simscale.com/forum/t/cht-v2-error/92003/2 "2020-12-31T15:01:21Z")

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Hi, @ykho,

I copied your project and tried to replicate the error message but I couldn’t. Instead, when trying to run the simulation (1), I received the following error messages:

 ![image](https://www.simscale.com/forum/uploads/default/original/3X/c/0/c0cc8434b8536783d53ac4c5b3d9855d9ab9ba7e.png)

You can access the problematic settings by clicking on the icons highlighted as (2) in the image above. In your case, the result controls have a dot “.” in the title, which is not allowed (e.g. try “half W” instead of “0.5 W”).

The third error is related to a badly assigned boundary condition to the symmetry BC:

 ![image](https://www.simscale.com/forum/uploads/default/original/3X/6/4/64850749bd8635e7930cd5cfb6fe2296672376dc.png)

After fixing these issues in the setup, the simulation should run.

Cheers

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**Author:** ![ykho](https://www.simscale.com/forum/user_avatar/www.simscale.com/ykho/32/13307_2.png) [@ykho](https://www.simscale.com/forum/u/ykho)\
**Post date:** [January 23, 2021, 2:11pm UTC](https://www.simscale.com/forum/t/cht-v2-error/92003/3 "2021-01-23T14:11:28Z")

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Hi @Ricardopg,

thanks a lot for your reply. I have corrected the issues you have pointed out. On the first try I still got the error message I showed in the first post. But after I incorporated the conventional CHT solver, I did start the CHT v2.0 solver. It’s rare, but only sharing the experiences with you.

Cheers