Hello Makeroid Community,
I just imported my project from App Inventor to Makeroid getting help from this tutorial (to change package name so I can publish it again as the same app.):
When I try to create an .apk, I get the error below as a yellow warning bubble at the top.
Error generating Yail for screen 4554960926670848_Screen1: : Cannot read property ‘type’ of null. Please fix and try packaging again.
What does this mean and what can I do to make this error disappear?
Can you show the blocks and the components?
Here are the blocks (all of them):
Here is the app interface:
Here are the invisible components:
Here are all of the Properties:
Hope you can resolve the problem 
I think I know the issue:
Can I see all the properties for all textboxes?
There are a total of 2 text boxes.
Here are the properties of the 1st one:
and here are the properties of the 2nd one:
Humm, can I take a look to the .AIA?
Do you want me to export the .aia file from Makeroid (after transfer) or from App Inventor (original: before transfer)?
Makeroid one
ai_Randomer.aia (491.7 KB)
Here you go
@Diego have you found a solution?
Not yet 
I have lots of exams, so until the 27th I won’t have much time…
Oh, OK. I will be waiting always.
(Good Luck with the Exams .)
@TurboProgramming, just a suggestion: Try to delete the components, one by one, and after delete it, try to generate the apk, until discover the error. This error can be related to a property from a component that internally was migrated with null.
great idea, but it will be soo hard to do it 
.
But I could start the project from the beginning, that would be easier (As it’s a small app.)
Thanks for the suggestion @Kleyber_Derick
You can replicate a project by choosing
File > Save Project As
by that what do you mean? @pavi2410
I had the same problem and it was solved by unchecking the option “NumbersOnly” in the TextBox components in AppInventor before exporting the AIA file, as suggested here (Error while compiling to apk - Bugs - Kodular Community), try that!
I will try, if it works I will let you know!
By the way thanks for the tip! 
If this is the error I will take a look at how why this is happening. I think its because we didn’t remove that property the right way.
We have done it wrong 
I make current some tests on it.
I have changed something in our code and importet a project form AI with a textbox where the numbers only block is enabled.
Then I have importet the project into our builder.
The apk works now. No crash. No error.
I make more tests on it.