Android Question Unable to open ... zip archive


Licensed User
Please help... i read this error compiling my project.
I solved by restarting my PC, but after some time the error occurs again, and when this error occurs I can't copy/move/delete the .apk file of my project even if the app (B4A) is closed.

B4A version 4.30
Parsing code. 0.48
Compiling code. 3.29

ObfuscatorMap.txt file created in Objects folder.
Compiling layouts code. 0.19
Generating R file. 0.01
Compiling generated Java code. 6.57
Convert byte code - optimized dex. 4.92
Packaging files. 1.14
Copying libraries resources 0.10
Found 7 resource files.
Signing package file (private key) 1.24
ZipAlign file. Error
Unable to open 'Scale_di_Valutazione_Pro.apk' as zip archive
Last edited:


Licensed User
Did you try turning off you antivirus? I might interfear.
If occurs again I'll try to disable antivirus, however it seems that the problem is independent B4A, maybe I was wrong to open a new thread about it...


Licensed User
sometimes I get file is in use errors aswell but that's because my project is in a drop box folder and it syncs immediatly to the server. recompiling again works fine then.