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# V0 can not solve the error undefined (reading 'toLowerCase')

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Huda  (@habdulqader-6640) · 2026-02-24

Suddenly, my project stopped working. I did not send any new prompt; it was working, and then the following error is displayed “Unhandled promise rejection: TypeError: Cannot read properties of undefined (reading 'toLowerCase')“, I tried tp solve it multiple times and used a lot of the credits and still not working. 

Please solve this ASAP


Pauline P. Narvas (@pawlean) · 2026-02-24

Hey, Huda! Welcome to the Vercel Community :waving_hand: 

What have you tried so far? 

It's difficult to give you more specific guidance without any chat links, or examples.

I recommend going through:
https://community.vercel.com/t/how-to-get-good-answers/158


Huda  (@habdulqader-6640) · 2026-02-24

I searched the v0 community already,  here the project link [https://v0.app/chat/package-creation-page-qnkPQjD0AK1](https://v0.app/chat/package-creation-page-qnkPQjD0AK1), please review it and share a new link with the working project.