Causes and Solutions for Android Studio “Could not Resolve All Files for Configuration”

What Is “Could not resolve all files for configuration”?

“Could not resolve all files for configuration” is an error indicating that Gradle could not resolve the files required to build the project.

In Android apps, libraries, plugins, and other components are managed by Gradle.
During the build process, the required files are retrieved from the configured repositories.

However, if a library cannot be retrieved or the specified version does not exist, Gradle cannot resolve the dependencies, and an error such as the following may be displayed.

Could not resolve all files for configuration ':app:debugRuntimeClasspath'.

Names such as
debugRuntimeClasspath,
debugCompileClasspath, and
classpath
displayed at the end of the error vary depending on the Gradle Configuration in which the problem occurred.

Main Causes

The main causes of “Could not resolve all files for configuration” include the following.

• No internet connection
• Unable to connect to Google Maven Repository or Maven Central
• Insufficient repositories settings
• A nonexistent library version has been specified
• Failed to retrieve a dependency library
• The Gradle cache is corrupted
• Gradle Offline mode is enabled
• The Gradle and Android Gradle Plugin versions are incompatible
• The JDK version is incompatible
• Communication is blocked by a proxy or firewall

Check the Details of the Error Message

First, check the entire error displayed in the Build window.

For example, it may be displayed as follows.

Could not resolve all files for configuration ':app:debugRuntimeClasspath'.

Could not find com.example:library:1.0.0.

In this case, the direct cause is that the library
com.example:library:1.0.0
cannot be found.

On the other hand, if a message such as the following is displayed, there may be a problem with the network or connection to the repository.

Could not GET 'https://...'

Connect timed out

Therefore, do not check only the first line, “Could not resolve all files for configuration,” but also check the errors displayed below it.

Check the Internet Connection

Gradle may download required libraries over the internet.
Therefore, if there is a problem with the network connection, it cannot retrieve the dependencies.

Use a web browser or another method to check whether you can connect to the internet normally.

If your Wi-Fi or other connection is unstable, reconnect to the network and then run Gradle Sync.

Check Gradle Offline Mode

If Gradle Offline mode is enabled, new dependencies cannot be retrieved from the internet.

Because Gradle attempts to build using only libraries that were downloaded previously, an error occurs if the required files are not present in the cache.

Check the Gradle settings in Android Studio, and if Offline mode is enabled, disable it.

After changing the setting, run Gradle Sync.

Run Gradle Sync

An error may occur simply because Gradle synchronization has not completed successfully.

Run Gradle Sync from Android Studio to retrieve the dependencies again.

Run the synchronization using
Sync Project with Gradle Files
or a similar option.

If the cause is a temporary communication error, resynchronizing alone may resolve the problem.

Check the repositories Settings

If the repositories required to retrieve the necessary libraries are not configured, Gradle cannot find the dependencies.

In Android projects, Google Maven Repository and Maven Central are commonly used.

repositories {
    google()
    mavenCentral()
}

In current Gradle projects, repositories may be configured inside
dependencyResolutionManagement
in
settings.gradle
or
settings.gradle.kts.

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)

    repositories {
        google()
        mavenCentral()
    }
}

If Kotlin DSL is being used, the file extension is
.gradle.kts.

Check the Library Version

This error may also occur if the specified library version does not exist.

For example, suppose the following dependency is specified.

implementation("com.example:library:1.0.0")

If this
1.0.0
does not exist in the repository, Gradle cannot retrieve the file.

If
Could not find
is displayed in the error message, check whether the specified library name or version is incorrect.

Check for Errors in Dependency Declarations

There may also be an error in the dependency declarations written in
build.gradle
or
build.gradle.kts.

In particular, check the following.

• group ID
• artifact ID
• Version number
• Symbols and quotation marks
• Differences in syntax between Kotlin DSL and Groovy DSL

Compare the declaration with the official documentation for the library and check whether the dependency is written correctly.

Retrieve the Gradle Cache Again

Files downloaded once by Gradle are stored as a cache.
If the cached files are corrupted, Gradle may not be able to resolve dependencies correctly.

In that case, retrieving the dependencies again may resolve the problem.

From the project’s Terminal, you can run Gradle with
--refresh-dependencies
as follows.

./gradlew build --refresh-dependencies

On Windows, depending on the environment, run the following.

gradlew.bat build --refresh-dependencies

This rechecks the dependency cache and retrieves the required files again.

Try Clean Project and Rebuild Project

If files generated during the build process are causing the problem, cleaning the project and rebuilding it may resolve the issue.

If the relevant menu items are available in Android Studio, run
Clean Project,
then run
Rebuild Project
or a normal Build.

When running it from Gradle, you can also execute
clean
as follows.

./gradlew clean

Check the Gradle and Android Gradle Plugin Versions

In Android Studio, there are version requirements for combinations of Gradle and the Android Gradle Plugin.

If only the Android Gradle Plugin is updated, or only the Gradle Wrapper is changed, the build may fail because of compatibility issues.

The Gradle Wrapper version can be checked in
gradle-wrapper.properties
and similar files.

distributionUrl=https\://services.gradle.org/distributions/gradle-X.X-bin.zip

Also check the Android Gradle Plugin version and confirm that it is compatible with the Gradle version being used.

Check the JDK Version

The required Java version may differ depending on the Gradle or Android Gradle Plugin version.

If the JDK version is not supported, Gradle itself may not operate correctly, which can lead to build errors.

Check the Gradle JDK setting in Android Studio and confirm that a JDK compatible with the Gradle and Android Gradle Plugin used by the project is selected.

Check the Proxy Settings

On company or school networks, it may be necessary to connect to external services through a proxy server.

If the proxy settings in Android Studio or Gradle are incorrect in this situation, Maven Repository and other services cannot be accessed.

If the error includes
Connection timed out,
Connection refused, or
Could not GET,
also check the network and proxy settings.

Check the Firewall and Security Software

Communication from Gradle may be blocked by a firewall, VPN, security software, or similar software.

Even if normal websites can be accessed, communication only to specific servers used by Gradle may be restricted.

If Gradle Sync works normally on a different network environment, the cause may be a restriction on the network side.

Check SSL and Certificate-Related Errors

SSL certificate-related errors may occur when Gradle connects to a repository over HTTPS.

If the error contains strings such as the following, there may be a problem with the certificate or HTTPS communication.

PKIX path building failed

SSLHandshakeException

In this case, check the JDK, network certificates, proxy, security software, and related settings.

In particular, on corporate networks, certificate errors may occur due to systems that intercept HTTPS communication.

If Only a Specific Library Cannot Be Retrieved

If other libraries can be retrieved normally but only a specific library results in
Could not resolve,
there may be a problem with that library.

Check the error message to identify the library that could not be retrieved.

Could not resolve com.example:library:1.0.0.

In this case, check the following points regarding the library.

• Whether the specified version exists
• Whether the repository where it is published has changed
• Whether the library itself is no longer being distributed
• Whether an additional Maven Repository is required

Check Whether an Old Repository Is Being Used

If an old Android project is opened in a current version of Android Studio, repositories or dependencies that were previously used may no longer be available.

The same applies when using old articles or sample code.

In particular, if you are using a library that has not been updated for a long time, check whether it is still being distributed.

Check for Dependency Conflicts

Problems may also occur because of conflicts between dependencies, such as when multiple libraries require different versions of the same dependency.

Gradle allows you to check the dependency structure.

./gradlew app:dependencies

By checking the displayed dependencies, you can investigate which library is requesting which version.

What to Check for Each Error

The error displayed together with “Could not resolve all files for configuration” can help narrow down what should be checked.

Steps to Check If the Problem Is Not Resolved

If the cause is unknown, checking the following in order makes it easier to narrow down the problem.

1. Check the errors displayed below “Could not resolve all files for configuration”
2. Check the internet connection
3. Check Gradle Offline mode
4. Run Gradle Sync
5. Check repository settings such as google() and mavenCentral()
6. Check the name and version of the library that could not be retrieved
7. Retrieve dependencies again with --refresh-dependencies
8. Clean the project and rebuild it
9. Check compatibility between Gradle and the Android Gradle Plugin
10. Check the JDK version
11. Check the proxy, VPN, firewall, and SSL certificate

Summary

Android Studio’s
“Could not resolve all files for configuration”
is an error displayed when Gradle cannot properly resolve the dependencies required for the build.

In some cases, simply checking the internet connection or running Gradle Sync resolves the problem, but incorrect library versions, repository settings, the Gradle cache, or compatibility between Gradle, the Android Gradle Plugin, and the JDK may also be the cause.

First, check the detailed error message displayed immediately after “Could not resolve all files for configuration,” and narrow down the cause based on messages such as
Could not find,
Could not GET, and
Connection timed out
to address the problem efficiently.