# My app when installed isn't working. Please help me
**URL:** https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516
**Category:** Questions about Thunkable X
**Created:** [May 24, 2021, 4:27pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516 "2021-05-24T16:27:52Z")
**Posts on this page:** 13
**Page:** 1
### Author:  [@pathcreator](https://community.thunkable.com/u/pathcreator)
#### Post date: [May 24, 2021, 4:27pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/1 "2021-05-24T16:27:52Z")
Hi all,
I just downloaded my APK file which I received through email.
It works fine in thunkable live.
Also, I downloaded the app a few days ago and it worked perfectly fine. I just made a few updates today and download it again. But now, it says “There has been a critical error”…and such…
I don’t know what to do… someone please help me…
I’m really worried right now.
I have to submit this today…
Please help me.
I’m desperate.
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### Author:  [@sketch](https://community.thunkable.com/u/sketch)
#### Post date: [May 24, 2021, 4:30pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/2 "2021-05-24T16:30:35Z")
Can you show us your blocks and the error message?
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### Author:  [@catsarisky](https://community.thunkable.com/u/catsarisky)
#### Post date: [May 24, 2021, 4:31pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/3 "2021-05-24T16:31:18Z")
I’ll take a wild guess - are you using stored variables? If so, are you checking if they’re null before trying to use them?
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### Author:  [@pathcreator](https://community.thunkable.com/u/pathcreator)
#### Post date: [May 24, 2021, 4:58pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/4 "2021-05-24T16:58:48Z")
@sketch,
Ok sure.
I’ll give you guys my thunkable link.
[https://x.thunkable.com/copy/10e377ee71994aa55e96e3b7a0302da3](https://x.thunkable.com/copy/10e377ee71994aa55e96e3b7a0302da3)
And the error message is shown when I click the button “Add Income”.
It shows the same error when I click the “Add Expense” button.
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### Author:  [@sketch](https://community.thunkable.com/u/sketch)
#### Post date: [May 24, 2021, 5:39pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/5 "2021-05-24T17:39:05Z")
i am unble to see the problem and test because the firebase tokens are set to empty.
Add those tokens and test again maybe that’s the problem.
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### Author:  [@catsarisky](https://community.thunkable.com/u/catsarisky)
#### Post date: [May 24, 2021, 5:57pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/6 "2021-05-24T17:57:50Z")
@pathcreator ,
So it crashes when you should go to add income screen sub main? Immediately, not after a button click on that other screen?
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### Author:  [@sketch](https://community.thunkable.com/u/sketch)
#### Post date: [May 24, 2021, 6:01pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/7 "2021-05-24T18:01:17Z")
Sorry @catsarisky i don’t really get what your saying.
Can you explain a bit further?
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### Author:  [@Dean\_Artis](https://community.thunkable.com/u/Dean_Artis)
#### Post date: [May 24, 2021, 6:17pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/8 "2021-05-24T18:17:25Z")
It’s you who needs to explain further. Tell us precisely when the crash occurs.
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### Author:  [@sketch](https://community.thunkable.com/u/sketch)
#### Post date: [May 24, 2021, 6:19pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/9 "2021-05-24T18:19:40Z")
It is not a crash i can’t test the app When it uses firebase with empty tokens.
Its the sign in screen.
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### Author:  [@catsarisky](https://community.thunkable.com/u/catsarisky)
#### Post date: [May 24, 2021, 6:32pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/10 "2021-05-24T18:32:25Z")
Uh, luke? I was responding to the original poster, who reports a crash!
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### Author:  [@pathcreator](https://community.thunkable.com/u/pathcreator)
#### Post date: [May 24, 2021, 6:39pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/11 "2021-05-24T18:39:21Z")
Thank you all for all your help!!!
It turns out to be a minor mistake of mine that caused the crash…
I gave “null” in an initialize variable block…instead of an empty string…
Many thanks to all who spent time to help me!!
(& sorry too)
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### Author:  [@sketch](https://community.thunkable.com/u/sketch)
#### Post date: [May 24, 2021, 6:41pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/12 "2021-05-24T18:41:25Z")
I know that @catsarisky .
The question Just wasn’t really clear to me.
So that’s why i asked.
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### Author:  [@ioannis](https://community.thunkable.com/u/ioannis)
#### Post date: [November 8, 2024, 1:22pm UTC](https://community.thunkable.com/t/my-app-when-installed-isnt-working-please-help-me/1304516/13 "2024-11-08T13:22:21Z")