# Type mismatch in timestamp in my dataset

**URL:** <https://forum.inductiveautomation.com/t/type-mismatch-in-timestamp-in-my-dataset/43476>\
**Category:** Ignition\
**Tags:** ignition81, vision, scripting, ignition80\
**Created:** [February 16, 2021, 7:06pm UTC](https://forum.inductiveautomation.com/t/type-mismatch-in-timestamp-in-my-dataset/43476 "2021-02-16T19:06:23Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![nickboratyn](https://avatars.discourse-cdn.com/v4/letter/n/9d8465/32.png) [@nickboratyn](https://forum.inductiveautomation.com/u/nickboratyn)\
**Post date:** [February 16, 2021, 7:06pm UTC](https://forum.inductiveautomation.com/t/type-mismatch-in-timestamp-in-my-dataset/43476/1 "2021-02-16T19:06:23Z")

</div>

I am trying populate a xy chart in ignition 8.1 vision with a dataset that consists of queried data. there is two columns, a t\_stamp and value.  
When I bind the dataset to the chart I get the error below:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/e/ae7cc529935df8eaf29d7c909ac2ec319e9c6c47.png)  
and this is the definition i am calling to create the dataset.  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/1/6106bd88a653f4470744ef3551c41ebaec7d6cbe.png)