Android project doesn't compile: "Namespace not specified".

[JustTheZaio]

I've downloaded the source code from here:
https://github.com/Etar-Group/Etar-Calendar

but when I try to compile and launch it, the following error message is shown:

**_Namespace not specified. Specify a namespace in the module's build file: C:\Development\Etar-Calendar\external\calendar\build.gradle. See https://d.android.com/r/tools/upgrade-assistant/set-namespace for information about setting the namespace.

If you've specified the package attribute in the source AndroidManifest.xml, you can use the AGP Upgrade Assistant to migrate to the namespace value in the build file. Refer to https://d.android.com/r/tools/upgrade-assistant/agp-upgrade-assistant for general information about using the AGP Upgrade Assistant._**

The weird thing is that inside the App build.gradle.kts the namespace is present

android { namespace = "ws.xsoh.etar" ...

Is it possible that I'm the only who face this bug? Tried to search similar problem inside the forum and on the web but couldn't find no solution for this.

[jspricke]

converted to discussion as it is not an issue. Did you try the instructions here? https://github.com/Etar-Group/Etar-Calendar?tab=readme-ov-file#build-instructions

[JustTheZaio]

I've tried, already on the first step "tools/bin/sdkmanager platform-tools"
when I go to the folder C:\Users\MyUser\AppData\Local\Android\Sdk\tools\bin and I launch that command, an exception is thrown

Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
at com.android.repository.api.SchemaModule$SchemaModuleVersion.(SchemaModule.java:156)
at com.android.repository.api.SchemaModule.(SchemaModule.java:75)
at com.android.sdklib.repository.AndroidSdkHandler.(AndroidSdkHandler.java:81)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
... 5 more

[jspricke]

your sdkmanager is too old for your JDK. There are a lot of answers to that in the internet.

[JustTheZaio]

You're right, after following the build instructions the project can compile. Thank you so much!