A problem occurred evaluating project ':app'. > path may not be null or empty string. path='null'

Iam facing error while iam trying to run flutter.

D:\fluttapp\testbuild>flutter run
Launching lib/main.dart on Google Pixel 2 XL in debug mode...
Initializing gradle... 2.1s
Resolving dependencies...
* Error running Gradle:
ProcessException: Process "D:\fluttapp\testbuild\android\gradlew.bat" exited abnormally:

FAILURE: Build failed with an exception.

* Where:
Build file 'D:\fluttapp\testbuild\android\app\build.gradle' line: 57

* What went wrong:
A problem occurred evaluating project ':app'.
> 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. Run with --scan to get full insights.

* Get more help at

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BUILD FAILED in 6s
Command: D:\fluttapp\testbuild\android\gradlew.bat app:properties


Please review your Gradle project setup in the android/ folder.

D:\fluttapp\testbuild>flutter doctor -v
[√] Flutter (Channel beta, v1.1.8, on Microsoft Windows [Version 10.0.17134.556], locale
en-IN)
• Flutter version 1.1.8 at D:\flutter
• Framework revision 985ccb6d14 (3 weeks ago), 2019-01-08 13:45:55 -0800
• Engine revision 7112b72cc2
• Dart version 2.1.1 (build 2.1.1-dev.0.1 ec86471ccc)

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
• Android SDK at D:\Users\Bhanu\AppData\Local
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• ANDROID_HOME = D:\Users\Bhanu\AppData\Local
• Java binary at: D:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)
• All Android licenses accepted.

[√] Android Studio (version 3.1)
• Android Studio at D:\Program Files\Android\Android Studio
• Flutter plugin version 29.0.1
• Dart plugin version 173.4700
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b02)

[√] Connected device (1 available)
• Google Pixel 2 XL • 192.168.50.101:5555 • android-x86 • Android 9 (API 28)

• No issues found!

I have add repo here. I have taken sample code to make release app version but unable to generate them. Key store is created and add to code repo

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][1]


[1]:

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For me it was a pathing problem.

I was following the flutter guide

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Create a file named <app dir>/android/key.properties that contains a reference to your keystore:

For some reason I (wrongfully) placed my "key.properties" in the app_dir/android/**app** folder, and this gave me the error.

* What went wrong:
A problem occurred evaluating project ':app'.
> path may not be null or empty string. path='null'

So check your pathing, and where your files are located :)


**Bonus info:**
What helped med was checking the "gradle.build" file with different settings, and it was always the storeFile file(keystoreProperties['storeFile']) that gave me problems.
Try commenting it out, or change it to:

storeFile file("key.jks")

If this works, you know that you have the correct path to your "key.jks" file. Then try introducing the poperties file (keystoreProperties)
Like

storeFile file(keystoreProperties['storeFile'])

This did not work at first, but it does now :)

So check again that you "key.jks" and "key.properties" files are located the "correct" places, and how you point to them.

If you are just testing or debugging and not releasing, you might consider changing the build type to be debug instead of release.

In <APP_FOLDER>/android/app/build.gradle

buildTypes {
release {
signingConfig signingConfigs.debug
}
}

If you downloaded the app from github, it is possible that signing configs are note adapted. Try like this to comment code on android/app/build.gradle :

/*signingConfigs {
release {
keyAlias keystoreProperties['keyAlias']
keyPassword keystoreProperties['keyPassword']
storeFile file(keystoreProperties['storeFile'])
storePassword keystoreProperties['storePassword']
}
}
buildTypes {
release {
// TODO: Add your own signing config for the release build.
// Signing with the debug keys for now, so `flutter run --release` works.
signingConfig signingConfigs.release
}
*/`

Solution find on :

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1)Check the Key in this Project"key.jks"

Go to "gradle.build"

and replace it

```
storeFile file("key.jks")
```

with

```
storeFile file(keystoreProperties['storeFile'])
```

There must be 2 files one with suffix
1. "debug"
2. "release"
Add these two file in your project through file explorer
Then edit the path in your file known as local.properties
1. debugStoreFile=C\:/Users/Sachin/Android_Studio_project...
2. storeFile=C\:/Users/Sachin/Android_Studio_project...

it works for me after deleting or comments

these lines(related to App key signing) from "build.gradle" file

//android.signingConfigs.release.storeFile rootProject.file(props.keyStore)
//android.signingConfigs.release.storePassword props.keyStorePassword
//android.signingConfigs.release.keyAlias props.keyAlias
//android.signingConfigs.release.keyPassword props.keyAliasPassword

I have used the

storeFile file(keystoreProperties['storeFile'])

on compiling it had thrown an error. But after replacing the above line with

storeFile file("key.jks")

Build was successful. I don't know how that has happened, though.

The problem occurred when you download an app from github

go to > android > app > build.gradle

in your build gradle file :--
signingConfigs {
release {
keyAlias keystoreProperties['keyAlias']
keyPassword keystoreProperties['keyPassword']
storeFile file(keystoreProperties['storeFile'])
storePassword keystoreProperties['storePassword']
}
}

Replace: storeFile file(keystoreProperties['storeFile'])
to: storeFile file("key.jks")

this worked for me

Replace: `storeFile file(keystoreProperties['storeFile'])`

to: `storeFile file("key.jks")`