# Why this Error keep on poping up?

**URL:** https://discuss.tryton.org/t/why-this-error-keep-on-poping-up/8906
**Category:** Developer
**Created:** [October 22, 2025, 9:16am UTC](https://discuss.tryton.org/t/why-this-error-keep-on-poping-up/8906 "2025-10-22T09:16:44Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![bromoapp](https://discuss-cdn.tryton.org/letter_avatar_proxy/v4/letter/b/71c47a/32.png) [@bromoapp](https://discuss.tryton.org/u/bromoapp)
#### Post date: [October 22, 2025, 9:16am UTC](https://discuss.tryton.org/t/why-this-error-keep-on-poping-up/8906/1 "2025-10-22T09:16:44Z")

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I have this error caused by field width in a tree, I am frustrated to get rid of it.. I even reset the columns from Front End.. but its just dont wanna go

 ![image](https://discuss-cdn.tryton.org/uploads/default/original/2X/f/f3e736dd9ea77af896298a0b536f0c37a64904d9.png)

```auto
Traceback (most recent call last):
  File "/trytond/wsgi.py", line 97, in dispatch_request
    return endpoint(request, **request.view_args)
  File "/trytond/protocols/dispatcher.py", line 44, in rpc
    return methods.get(request.rpc_method, _dispatch)(
  File "/trytond/wsgi.py", line 77, in wrapper
    return func(request, *args, **kwargs)
  File "/trytond/protocols/wrappers.py", line 206, in wrapper
    result = func(request, pool, *args, **kwargs)
  File "/trytond/protocols/dispatcher.py", line 216, in _dispatch
    result = rpc.result(meth(*c_args, **c_kwargs))
  File "/trytond/ir/ui/view.py", line 554, in set_width
    tree_width.width = fields.pop(tree_width.field)
KeyError: 'start_date'

```

Anybody can advice would be appreciated

Bromo

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<div class="post-metadata">

### Author: ![ced](https://discuss-cdn.tryton.org/user_avatar/discuss.tryton.org/ced/32/1237_2.png) [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [October 22, 2025, 9:54am UTC](https://discuss.tryton.org/t/why-this-error-keep-on-poping-up/8906/2 "2025-10-22T09:54:34Z")

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Probably because you do not have the fix for [Crash when setting tree width with a field already saved multiple times (#13997) · Issues · Tryton / Tryton · GitLab](https://bugs.tryton.org/13997)

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<div class="post-metadata">

### Author: ![bromoapp](https://discuss-cdn.tryton.org/letter_avatar_proxy/v4/letter/b/71c47a/32.png) [@bromoapp](https://discuss.tryton.org/u/bromoapp)
#### Post date: [October 23, 2025, 12:10pm UTC](https://discuss.tryton.org/t/why-this-error-keep-on-poping-up/8906/4 "2025-10-23T12:10:12Z")

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I emptied the entire **ir\_ui\_view\_tree\_width** table.. and that error pop-up caused by tree-field width gone.. but then when I custom an existing width of one of the list xml.. the error start poping up again.. then I truncate again. the **ir\_ui\_view\_tree\_width** table.. but when I restart and refresh the page.. the **ir\_ui\_view\_tree\_width** auto populated.. then start the error pop-up again

this is really annoying. I cannot seems to customize a widht of a field without worriying.

Bromo

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<div class="post-metadata">

### Author: ![bromoapp](https://discuss-cdn.tryton.org/letter_avatar_proxy/v4/letter/b/71c47a/32.png) [@bromoapp](https://discuss.tryton.org/u/bromoapp)
#### Post date: [October 23, 2025, 3:31pm UTC](https://discuss.tryton.org/t/why-this-error-keep-on-poping-up/8906/5 "2025-10-23T15:31:25Z")

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I managed to fix this.. thanks @ced 👍