# Critical error occured when trying to login in my thunkable app on other devices

**URL:** <https://community.thunkable.com/t/critical-error-occured-when-trying-to-login-in-my-thunkable-app-on-other-devices/1934293>\
**Category:** Questions about Thunkable X\
**Tags:** firebase, beginner, login, crash, auth\
**Created:** [June 21, 2022, 10:22am UTC](https://community.thunkable.com/t/critical-error-occured-when-trying-to-login-in-my-thunkable-app-on-other-devices/1934293 "2022-06-21T10:22:04Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![thinkable475gmyu](https://avatars.discourse-cdn.com/v4/letter/t/8edcca/32.png) [@thinkable475gmyu](https://community.thunkable.com/u/thinkable475gmyu)\
**Post date:** [June 21, 2022, 10:22am UTC](https://community.thunkable.com/t/critical-error-occured-when-trying-to-login-in-my-thunkable-app-on-other-devices/1934293/1 "2022-06-21T10:22:04Z")

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hello,  
i have crated an app which includes user registration and login pages and a small quiz of 10 questions ,called “Quiz”.  
this app is working fine on thunkable website web preview, and also working fine on my mobile as i have downloaded thunkable app and run this quiz app through thunkable. but when i downloaded apk file and shared it to other device, after installing it worked for starting 2-3 screens ,but after taking user id and password when user hits login button it showed this screen

 ![Screenshot_2022-06-21-15-41-45-526_com.gmail.thinkable475.dbquiz](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/a/c/acc0b7ae474f3a6abb006448f83416fb01342779.jpeg)  
 ![Screenshot_2022-06-21-15-41-59-397_com.gmail.thinkable475.dbquiz](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/b/a/bacd7f54e5ab879bce0d73fa7e78cdc627b60b88.jpeg)  
plz help as i am new to this thunkable platform.

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**Author:** ![jared](https://sea1.discourse-cdn.com/flex015/user_avatar/community.thunkable.com/jared/32/138473_2.png) [@jared](https://community.thunkable.com/u/jared)\
**Post date:** [June 22, 2022, 1:30am UTC](https://community.thunkable.com/t/critical-error-occured-when-trying-to-login-in-my-thunkable-app-on-other-devices/1934293/2 "2022-06-22T01:30:12Z")

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Please check this out. Perhaps some debugging would be helpful.

[Debugging in Thunkable X (Video)](https://community.thunkable.com/t/debugging-in-thunkable-x-video/849471)

Does the app work when you preview in the app builder?

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**Author:** ![verma.sunita008g2](https://avatars.discourse-cdn.com/v4/letter/v/7cd45c/32.png) [@verma.sunita008g2](https://community.thunkable.com/u/verma.sunita008g2)\
**Post date:** [June 23, 2022, 10:40am UTC](https://community.thunkable.com/t/critical-error-occured-when-trying-to-login-in-my-thunkable-app-on-other-devices/1934293/3 "2022-06-23T10:40:28Z")

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![Screenshot_2022-06-21-15-41-59-397_com.gmail.thinkable475.dbquiz](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/b/a/bacd7f54e5ab879bce0d73fa7e78cdc627b60b88.jpeg)

 ![Screenshot_2022-06-21-15-41-45-526_com.gmail.thinkable475.dbquiz](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/a/c/acc0b7ae474f3a6abb006448f83416fb01342779.jpeg)

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**Author:** ![system](https://us1.discourse-cdn.com/flex015/uploads/thunkable/original/3X/0/f/0f59f292712368bce16ff80133ae10de8a6f27e8.png) [@system](https://community.thunkable.com/u/system)\
**Post date:** [September 21, 2022, 10:41am UTC](https://community.thunkable.com/t/critical-error-occured-when-trying-to-login-in-my-thunkable-app-on-other-devices/1934293/4 "2022-09-21T10:41:04Z")

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