# 2+1D Pouch Cell Model-Error in checking negative electrode potential

**URL:** <https://pybamm.discourse.group/t/2-1d-pouch-cell-model-error-in-checking-negative-electrode-potential/44>\
**Category:** PyBaMM Q&A\
**Created:** [27 November 2024 15:15 UTC](https://pybamm.discourse.group/t/2-1d-pouch-cell-model-error-in-checking-negative-electrode-potential/44 "2024-11-27T15:15:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Santiago\_peace](https://yyz2.discourse-cdn.com/free1/user_avatar/pybamm.discourse.group/santiago_peace/32/16_2.png) [@Santiago\_peace](https://pybamm.discourse.group/u/Santiago_peace)\
**Post date:** [27 November 2024 15:15 UTC](https://pybamm.discourse.group/t/2-1d-pouch-cell-model-error-in-checking-negative-electrode-potential/44/1 "2024-11-27T15:15:02Z")

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Hello, when I use the options = {“current collector”: “potential pair” and “dimension”: 2}, I am going to check the change of negative potential, but there is an error. I hope you can help me solve it. Thank you very much.

 ![image](https://global.discourse-cdn.com/free1/uploads/pybamm/original/1X/d371257b00ff83ae25b7511ed716bc10cfec23d3.png)

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**Author:** ![brosaplanella](https://yyz2.discourse-cdn.com/free1/user_avatar/pybamm.discourse.group/brosaplanella/32/6_2.png) [@brosaplanella](https://pybamm.discourse.group/u/brosaplanella)\
**Post date:** [27 November 2024 15:24 UTC](https://pybamm.discourse.group/t/2-1d-pouch-cell-model-error-in-checking-negative-electrode-potential/44/2 "2024-11-27T15:24:02Z")

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I believe the issue is that you are trying to process a 3D variable, which is not implemented yet. You can try plotting smaller dimension variables, like the current collector potential or the averaged electrode potential over the current collector.

PS: from the error it looks like you are running an old version of PyBaMM, you may want to update to a newer version (note this won’t fix the issue).

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**Author:** ![Santiago\_peace](https://yyz2.discourse-cdn.com/free1/user_avatar/pybamm.discourse.group/santiago_peace/32/16_2.png) [@Santiago\_peace](https://pybamm.discourse.group/u/Santiago_peace)\
**Post date:** [28 November 2024 03:10 UTC](https://pybamm.discourse.group/t/2-1d-pouch-cell-model-error-in-checking-negative-electrode-potential/44/3 "2024-11-28T03:10:56Z")

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Thank you very much for your reply and answer