I'm having this problem with the program, what could be the problem?
Qarshi_turizm (1).aia (1.8 MB)
From the compile complaint about there being an error in XML, I deduced that the problem was in a blocks section of a screen.
Using 7zip to examine the sizes of the screen components in the uncompressed .aia file, I narrowed it down to 3 possible .bky files in the src subdirectories capable of holding enough bytes to match the columnNumber in the error message.
Examining the blocks sections of those 3 screens, I encountered this loose unreferenced block
in screen hayot.
Using the code.appinventor.mit.edu server, I deleted that block and requested a build.
It built.
(I was lucky.)
Qarshi_turizm1 (1).aia (1.6 MB)
Keeping your app's text in blocks is risky, and a strain on the Blocks Editor.
I recommend learning to load the text from structured (HTML or JSON) files, and to reuse components like ListViews.
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Thank you 
Can you provide any information on this matter?
Regarding how to separate data and code, search this board for Go Scroll Yourself
It's a Web scraping biographical data base.
Also search for Wheres_MIT, a table based network map of the universe.
thanks
Thanks