# Error: Developer Mode login - invalid format
**URL:** https://forum.webostv.developer.lge.com/t/error-developer-mode-login-invalid-format/26621
**Category:** Web App Development
**Created:** [June 18, 2025, 11:39pm UTC](https://forum.webostv.developer.lge.com/t/error-developer-mode-login-invalid-format/26621 "2025-06-18T23:39:21Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@papa.h](https://forum.webostv.developer.lge.com/u/papa.h)
#### Post date: [June 18, 2025, 11:39pm UTC](https://forum.webostv.developer.lge.com/t/error-developer-mode-login-invalid-format/26621/1 "2025-06-18T23:39:21Z")
I’ve tried un/reinstalling Developer Mode, but I get the same result.
- TV model name: 27ART10AKPL
- TV software version: (not seeing this)
- webOS TV version: webOS24 / 9.2.1-2701
- Region: NA
- Developer Mode app version: 2.1.4
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### Author:  [@narae0.kim](https://forum.webostv.developer.lge.com/u/narae0.kim)
#### Post date: [June 19, 2025, 12:01am UTC](https://forum.webostv.developer.lge.com/t/error-developer-mode-login-invalid-format/26621/2 "2025-06-19T00:01:15Z")
We have confirmed that a new version of TV SW for 27ART10AKPL, 23.21.41, has been updated on June 18th. Please check your TV SW update and try again. Thank you.
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### Author:  [@papa.h](https://forum.webostv.developer.lge.com/u/papa.h)
#### Post date: [June 19, 2025, 6:17am UTC](https://forum.webostv.developer.lge.com/t/error-developer-mode-login-invalid-format/26621/3 "2025-06-19T06:17:23Z")
Yes, this issue came about after the TV did an auto-update overnight.
Sorry, forgot to mention that important bit.
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### Author:  [@narae0.kim](https://forum.webostv.developer.lge.com/u/narae0.kim)
#### Post date: [June 19, 2025, 7:37am UTC](https://forum.webostv.developer.lge.com/t/error-developer-mode-login-invalid-format/26621/4 "2025-06-19T07:37:37Z")
If the problem persists with the latest version of TV SW, please share your TV SW version. You can check it in the Settings \> Support \> Software Update \> Software Version menu. Thank you.
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### Author:  [@papa.h](https://forum.webostv.developer.lge.com/u/papa.h)
#### Post date: [June 22, 2025, 10:59pm UTC](https://forum.webostv.developer.lge.com/t/error-developer-mode-login-invalid-format/26621/5 "2025-06-22T22:59:21Z")
> [@narae0.kim](#):
>
> 23.21.41
Yes, it’s using the new version: 23.21.41
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### Author:  [@Dooroof](https://forum.webostv.developer.lge.com/u/Dooroof)
#### Post date: [June 22, 2025, 10:59pm UTC](https://forum.webostv.developer.lge.com/t/error-developer-mode-login-invalid-format/26621/6 "2025-06-22T22:59:23Z")
I have a same issue. here’s my info below:
model name: 27ART10CMPL
software version: 23.21.41
webOS version: webOS24 / 9.2.1-2701
Region: ROK
Developer Mode app version: 2.1.4
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### Author:  [@narae0.kim](https://forum.webostv.developer.lge.com/u/narae0.kim)
#### Post date: [June 23, 2025, 7:20am UTC](https://forum.webostv.developer.lge.com/t/error-developer-mode-login-invalid-format/26621/7 "2025-06-23T07:20:04Z")
We apologize for any inconvenience this may have caused. The issue has been fixed in the latest version of the Developer Mode app. Please try reinstalling the developer mode app. Thank you.
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### Author:  [@papa.h](https://forum.webostv.developer.lge.com/u/papa.h)
#### Post date: [June 24, 2025, 6:57am UTC](https://forum.webostv.developer.lge.com/t/error-developer-mode-login-invalid-format/26621/8 "2025-06-24T06:57:27Z")
The issue’s been resolved. Thanks!