Gradle: path may not be null or empty string. path='null'

[unicornlox]

When I run this command, I get this error;
buildozer android release
then i have got error:

[INFO]:    STDOUT:
	Picked up _JAVA_OPTIONS:   -Dawt.useSystemAAFontSettings=gasp	
Starting a Gradle Daemon (subsequent builds will be faster)	
	
FAILURE: Build failed with an exception.	
	
* Where:	
Build file '/home/yemrems/Documents/derleiki/.buildozer/android/platform/build/dists/simplem/build.gradle' line: 34	
	
* What went wrong:	
A problem occurred evaluating root project 'simplem'.	
> path may not be null or empty string. path='null'	
	
* Try:	
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.	
	
BUİLD FAILED	
	
Total time: 29.138 secs	

[INFO]:    STDERR:
	
[INFO]:    COMMAND:
cd /home/yemrems/Documents/derleiki/.buildozer/android/platform/build/dists/simplem && ./gradlew assembleRelease

[WARNING]: ERROR: ./gradlew failed!

my build.gradle is ;

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
       jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.1'
    }
}

allprojects {
    repositories {
        jcenter()
	    flatDir {
	    	dirs 'libs'
	    }
    }
}

apply plugin: 'com.android.application'

android {
	compileSdkVersion 19
	buildToolsVersion '27.0.1'
	defaultConfig {
		minSdkVersion 9
		targetSdkVersion 19
		versionCode 1
		versionName '0.1'
	}

	signingConfigs {
		release {
			storeFile file(System.getenv("P4A_RELEASE_KEYSTORE"))
			keyAlias System.getenv("P4A_RELEASE_KEYALIAS")
			storePassword System.getenv("P4A_RELEASE_KEYSTORE_PASSWD")
			keyPassword System.getenv("P4A_RELEASE_KEYALIAS_PASSWD")
		}
	}

	buildTypes {
		debug {
		}
		release {
			signingConfig signingConfigs.release
		}
	}

    sourceSets {
        main {
            jniLibs.srcDir 'libs' 
            }
        }

}

dependencies {
}

my java version:

Picked up _JAVA_OPTIONS:   -Dawt.useSystemAAFontSettings=gasp
openjdk version "1.8.0_141"
OpenJDK Runtime Environment (build 1.8.0_141-8u141-b15-3-b15)
OpenJDK 64-Bit Server VM (build 25.141-b15, mixed mode)

./gradlew -version is:

Picked up _JAVA_OPTIONS:   -Dawt.useSystemAAFontSettings=gasp
Downloading https://services.gradle.org/distributions/gradle-3.2.1-bın.zip

Exception in thread "main" java.io.FileNotFoundException: https://downloads.gradle.org/distributions/gradle-3.2.1-bın.zip
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1872)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474)
	at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:254)
	at org.gradle.wrapper.Download.downloadInternal(Download.java:60)
	at org.gradle.wrapper.Download.download(Download.java:45)
	at org.gradle.wrapper.Install$1.call(Install.java:62)
	at org.gradle.wrapper.Install$1.call(Install.java:48)
	at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:69)
	at org.gradle.wrapper.Install.createDist(Install.java:48)
	at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:107)
	at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)

gradle -v is ;

Picked up _JAVA_OPTIONS:   -Dawt.useSystemAAFontSettings=gasp

------------------------------------------------------------
Gradle 3.2.1
------------------------------------------------------------

Build time:   2012-12-21 00:00:00 UTC
Revision:     none

Groovy:       2.4.8
Ant:          Apache Ant(TM) version 1.9.9 compiled on June 29 2017
JVM:          1.8.0_141 (Oracle Corporation 25.141-b15)
OS:           Linux 4.9.0-deepin13-amd64 amd64

thank you very much already for your help.

[inclement]

Thanks for the detailed report. Are you trying to build a release apk, and do you have the environment variables in the signing config section of build.gradle set? If not, I think that will cause the error. This is a bug in buildozer.

[unicornlox]

I tried the command like this ; buildozer android release apk but I am getting the same error again.
How should I organize the file named build.gradle?
I have no idea.

[inclement]

There should be a templates folder in the folder where you found the build.gradle, containing a file that looks like /~https://github.com/kivy/python-for-android/blob/master/pythonforandroid/bootstraps/sdl2/build/templates/build.tmpl.gradle#L32 . If you can find that, open it and delete lines 32 to 41 (the {% if args.sign %} block).

[unicornlox]

32 to 41 and 47 to 49 so ;

{% if args.sign -%}
	signingConfigs {
		release {
			storeFile file(System.getenv("P4A_RELEASE_KEYSTORE"))
			keyAlias System.getenv("P4A_RELEASE_KEYALIAS")
			storePassword System.getenv("P4A_RELEASE_KEYSTORE_PASSWD")
			keyPassword System.getenv("P4A_RELEASE_KEYALIAS_PASSWD")
		}
	}
    {%- endif %}

and

{% if args.sign -%}
			signingConfig signingConfigs.release
			{%- endif %}

I have successfully completed the process when I deleted these codes.
thank you so much

[tito]

i tried to implement a fix for that in master: if the env variables are not passed, --sign will not be used.