# Can't use the sum operator with bubble charts

**URL:** <https://forum.bubble.io/t/cant-use-the-sum-operator-with-bubble-charts/193486>\
**Category:** Need help\
**Created:** [February 24, 2022, 6:50pm UTC](https://forum.bubble.io/t/cant-use-the-sum-operator-with-bubble-charts/193486 "2022-02-24T18:50:21Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![alex46](https://avatars.discourse-cdn.com/v4/letter/a/94ad74/32.png) [@alex46](https://forum.bubble.io/u/alex46)\
**Post date:** [February 24, 2022, 6:50pm UTC](https://forum.bubble.io/t/cant-use-the-sum-operator-with-bubble-charts/193486/1 "2022-02-24T18:50:21Z")

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Hey there, I was following Gregory John’s very [helpful video](https://www.youtube.com/watch?v=3eX56jsPbas) on using charts in Bubble, and it all made sense in terms of aggregation to make a cumulative chart and add up all the values on a line graph.

Unfortunately I can’t seem to use the ‘sum’ operator on the value expression.

See John’s screenshot here:

 ![image](https://us1.discourse-cdn.com/bubble/original/3X/7/5/75b9d6d5db5db95a55b90c001e07d4a67edd8075.jpeg)

Here’s mine:

 ![image](https://us1.discourse-cdn.com/bubble/original/3X/1/1/116002d6b9d09f532d083c347361231b4d35d3de.jpeg)

I’ve followed all the steps but can’t seem to grab the ‘sum’ operator that he used.

Thanks for any help in advance

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**Author:** ![Jici](https://sea1.discourse-cdn.com/bubble/user_avatar/forum.bubble.io/jici/32/30722_2.png) [@Jici](https://forum.bubble.io/u/Jici)\
**Post date:** [February 24, 2022, 9:23pm UTC](https://forum.bubble.io/t/cant-use-the-sum-operator-with-bubble-charts/193486/2 "2022-02-24T21:23:39Z")

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Normally you should reference the data source grouping in value expression and not do a new Do a search for. Same for Label expression (First screenshot, you use Current point’s date… it will be the amount:sum)

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<div class="post-metadata">

**Author:** ![alex46](https://avatars.discourse-cdn.com/v4/letter/a/94ad74/32.png) [@alex46](https://forum.bubble.io/u/alex46)\
**Post date:** [February 24, 2022, 10:55pm UTC](https://forum.bubble.io/t/cant-use-the-sum-operator-with-bubble-charts/193486/3 "2022-02-24T22:55:02Z")

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I believe this is needed for cumulative line graph?

Cheers,

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**Author:** ![system](https://us1.discourse-cdn.com/bubble/original/3X/2/8/2847faa74692c2ffa5d939d3dc3724cdd060d247.png) [@system](https://forum.bubble.io/u/system)\
**Post date:** [May 5, 2022, 6:51pm UTC](https://forum.bubble.io/t/cant-use-the-sum-operator-with-bubble-charts/193486/4 "2022-05-05T18:51:07Z")

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Closed on May 5, 2022, 6:51pm UTC

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