# Internal error when adding polyline from variables

**URL:** <https://community.thunkable.com/t/internal-error-when-adding-polyline-from-variables/54283>\
**Category:** Questions about Thunkable X\
**Created:** [October 30, 2018, 7:46am UTC](https://community.thunkable.com/t/internal-error-when-adding-polyline-from-variables/54283 "2018-10-30T07:46:26Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![actech](https://avatars.discourse-cdn.com/v4/letter/a/3d9bf3/32.png) [@actech](https://community.thunkable.com/u/actech)\
**Post date:** [October 30, 2018, 6:56pm UTC](https://community.thunkable.com/t/internal-error-when-adding-polyline-from-variables/54283/3 "2018-10-30T18:56:59Z")

</div>

Use old type variables that can be obtained from the function block to which the parameters are added.

> [@Polylines from JSON string?](http://community.thunkable.com/t/polylines-from-json-string/53936/9):
>
> To improve your mood, a simple example with JSON data for a polyline. sunglasses I also show the magic of turning a string into a numeric type. [%D0%B8%D0%B7%D0%BE%D0%B1%D1%80%D0%B0%D0%B6%D0%B5%D0%BD%D0%B8%D0%B5]

---

_[View the full topic](https://community.thunkable.com/t/internal-error-when-adding-polyline-from-variables/54283)._