Help with old app made with appy builder

i made an app 6 years ago in appy builder.
Now i want to continue developing it, but after importing in kodular it give error “unable to find component listutils”. I found this old extensions but how i can give it to kodular?
Kodular stuck on opening my aia with “getting things ready” screen spinning forever.
Thanks to who will try to help me!

Welcome to Community

You cannot import another builder’s AIA into Kodular.


Thanks, but isn’t appy builder the kodular precursor?
Then my code is lost? There isn’t a workaround to rescue it?

You need to recreate everything in your Kodular project

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Ok but i thought that my aia is the source code but if i can’t read or open it, my code is lost forever.
Please help me to rescue my code…

Try this


Thanks, i already tried this site but how to recreate the app interface? Anyway the possibility to view blocks is a good thing.

you could open the aia file using 7zip and edit the bky and scm files and remove that component manually
then try again to open the project
@Boban is our specialist in project surgery



thanks taifun,
i have some 5 lines like this…

<mutation component_type="ListUtils" method_name="SortList" is_generic="false" instance_name="ListUtils1"></mutation>
                                                                    <field name="COMPONENT_SELECTOR">ListUtils1</field>

i have to delete entire lines wherever these appair in every bky and scm?
how to recreate the listutils function then?

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  • Download AppyBuilder (offline version) from GitHub,
  • install it,
  • import your project and open it,
  • remove the ListUtils component and replace it with the ListUtils extension.
  • Try to import the project into Kodular.
  • If necessary, remove any other components that are not compatible with Kodular and replace them with extensions if possible.


Good advice thank you!

For appybuilder offline, I have to install java jdk registering me on the
platform? Or there is a workaround?

Operating system?
See e.g. here: Java SE Development Kit Download - ComputerBase

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Thank you!

Sorry if i ask too much…this will work instead of oracle one?

I use win10.

Why else would I have sent you the link?

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Btw, did you back up your AppyBilder keystore back then? If not, you won’t be able to update your app in the Play Store (without Google assigning you a new keystore).

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Hehe sorry, you’re right. I’ll try

I think yes that i should have saved it…i hope! :grin:

I installed the zip here:

for win 10.

Changed environment variables and tested in prompt the java version.
It appears correct:

openjdk version “22.0.1” 2024-04-16
OpenJDK Runtime Environment (build 22.0.1+8-16)
OpenJDK 64-Bit Server VM (build 22.0.1+8-16, mixed mode, sharing)

When i start appybuilderfrontend i have this error:

“Starting AppInventor…”
Executing [F:\Programmi\Java\jdk-22.0.1\bin\java, -D–enable_all_permissions=true, -Duse_jetty9_runtime=true, -Xbootclasspath/p:G:\AppyBuilderPersonal-master\AppEngine\lib\override\appengine-dev-jdk-overrides.jar, -classpath, G:\AppyBuilderPersonal-master\AppEngine\lib\appengine-tools-api.jar,, --property=kickstart.user.dir=G:\AppyBuilderPersonal-master, --no_java_agent, --port=8888, --address=, G:\AppyBuilderPersonal-master\GUIServer]
Error: Could not create the Java Virtual Machine.
-Xbootclasspath/p is no longer a supported option.
Error: A fatal exception has occurred. Program will exit.

I don’t know how to do to fix this problem…

Try jdk 8 instead of 22

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