# Error Expression Eval Tag History

**URL:** <https://forum.inductiveautomation.com/t/error-expression-eval-tag-history/94625>\
**Category:** Ignition\
**Created:** [August 14, 2024, 4:18am UTC](https://forum.inductiveautomation.com/t/error-expression-eval-tag-history/94625 "2024-08-14T04:18:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Fadillah\_Ariadinata](https://avatars.discourse-cdn.com/v4/letter/f/4af34b/32.png) [@Fadillah\_Ariadinata](https://forum.inductiveautomation.com/u/Fadillah_Ariadinata)\
**Post date:** [August 14, 2024, 4:18am UTC](https://forum.inductiveautomation.com/t/error-expression-eval-tag-history/94625/1 "2024-08-14T04:18:00Z")

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i have some issue when i try to binding my time series chart to my data on dropdown, i have this error massage and try to figure out but still not have idea

 ![error binding](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/b/0be8fb82c51a48fb3aa0cc0def8a4e9b5e0ac326.png)

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**Author:** ![pascal.fragnoud](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pascal.fragnoud/32/24728_2.png) [@pascal.fragnoud](https://forum.inductiveautomation.com/u/pascal.fragnoud)\
**Post date:** [August 14, 2024, 7:10am UTC](https://forum.inductiveautomation.com/t/error-expression-eval-tag-history/94625/2 "2024-08-14T07:10:20Z")

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The expression mode of the tag history binding expects a very specific format.  
IIRC, it should be a list of objects, each with a "path" property. I'm willing to bet you don't have the proper format.

See this for how to do it:

> **[Tag History Bindings in Perspective | Ignition User Manual](https://www.docs.inductiveautomation.com/docs/8.1/ignition-modules/perspective/working-with-perspective-components/bindings-in-perspective/tag-history-bindings-in-perspective#using-dynamic-tag-paths)**
>
> Tag History Binding

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<div class="post-metadata">

**Author:** ![Fadillah\_Ariadinata](https://avatars.discourse-cdn.com/v4/letter/f/4af34b/32.png) [@Fadillah\_Ariadinata](https://forum.inductiveautomation.com/u/Fadillah_Ariadinata)\
**Post date:** [August 14, 2024, 8:14am UTC](https://forum.inductiveautomation.com/t/error-expression-eval-tag-history/94625/3 "2024-08-14T08:14:04Z")

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i has finish my issue with make custom properties  
 ![solve problem](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/5/659e3c0e18f741435d74dccaa35498dc58c7cd77.png)