What this error means and why it happens

The "Could Not Resolve All Files For Configuration ':app:debugruntimeclasspath'" error stops your Android project from building. It means Android Studio cannot find or download one or more libraries your app needs to run. This usually happens when a dependency (a piece of code your project relies on) is missing, outdated, or stored in a location Android Studio cannot reach.

The error appears in the Gradle build output — the panel at the bottom of Android Studio that shows build progress. It does not mean your code is wrong; it means the build system cannot assemble all the pieces your code needs.

Key Takeaways

  • The error occurs when Gradle cannot download or locate a library your project depends on, usually because of a network issue, a typo in the dependency name, or a removed repository.
  • The first step is to check the full error message in the Gradle output panel to see which specific dependency is missing.
  • Syncing your project with Gradle files and clearing the build cache fixes most cases without changing your code.
  • If a library has been removed or moved, you may need to update the dependency version or switch to an alternative library.
  • Adding the correct repository (like Google's Maven repository or Maven Central) to your build.gradle file often resolves the issue.

Find which dependency is causing the problem

Android Studio shows you which library it cannot find, but the message can be long and hard to read. Open the Gradle output panel at the bottom of Android Studio and look for the line that says "Could not resolve". It will name a specific library and version number.

For example, you might see "Could not resolve com.google.android.material:material:1.5.0". This tells you the project is looking for version 1.5.0 of Google's Material Design library and cannot find it. Write down the exact name and version — you will need it in the next steps.

If the output is too long to read, click the "Copy" button in the Gradle panel and paste it into a text editor. Search for "Could not resolve" to find the exact line.

Sync your project and clear the cache

Before making any changes, try the simplest fix first. Go to the top menu and click File, then Sync Now. This tells Gradle to re-read your build files and try downloading dependencies again. Sometimes the download failed the first time for a temporary reason — a network hiccup, a server timeout — and trying again works.

If syncing does not work, clear the Gradle cache. Go to File > Invalidate Caches > Invalidate and Restart. Click the button and let Android Studio restart. This forces it to re-download all dependencies from scratch instead of using old cached copies that might be corrupted.

After the restart, go to File > Sync Now again. This is the fastest fix for most cases.

Add the correct repository to your build.gradle file

Libraries live in repositories — online storage locations where Gradle downloads them. If a repository is missing from your project, Gradle cannot find the library even if it exists. Open your project's build.gradle file (the one at the project root, not the one inside the app folder). Look for a section called repositories.

Most Android projects need two repositories: Google's Maven repository and Maven Central. If your repositories block looks empty or only has one, add both. Your repositories section should look like this:

repositories {     google()     mavenCentral() }

If you are using older Gradle versions, you may need to write out the full URLs instead of using the shorthand names. Ask in the error message or check the library's documentation for the exact repository URL. After adding repositories, go to File > Sync Now.

Check the dependency name and version in your app build.gradle

Open the build.gradle file inside your app folder (usually labeled "app" in the file tree). Find the dependencies section and look for the library that is failing to resolve. Check three things: the group name, the artifact name, and the version number.

A dependency line looks like this: implementation 'com.google.android.material:material:1.5.0'. The parts are the group (com.google.android.material), the artifact (material), and the version (1.5.0). If any part has a typo, Gradle will not find it.

If the version number is very old or very new, it might not exist. Check the library's official documentation or GitHub page to see what versions are actually available. If the version does not exist, change it to a version that does. For example, if 1.5.0 does not exist, try 1.4.0 or 1.6.0.

Remove or replace outdated dependencies

Sometimes a library is removed from its repository entirely, or the version you are using is no longer hosted. If you have confirmed the version does not exist, you have two options: update to a newer version, or switch to a different library.

To update, change the version number in your dependencies block. For example, change implementation 'com.example:oldlib:1.0.0' to implementation 'com.example:oldlib:2.0.0'. After changing it, go to File > Sync Now.

If the entire library is no longer maintained, search for an alternative. Many older libraries have modern replacements. For example, if you are using an old networking library, consider switching to Retrofit or OkHttp. Check your code to see what the library does, then search for "Android [what it does] library 2024" to find current options.

Check your internet connection and firewall

Gradle needs to download libraries from the internet. If your network is slow, blocked, or behind a corporate firewall, downloads can fail. Try opening a web browser and visiting https://repo.maven.apache.org/maven2 or https://maven.google.com. If these sites do not load, your network is blocking them.

If you are on a corporate network, ask your IT department if they have a proxy server or firewall rule that blocks Maven repositories. Some companies require you to configure Gradle to use a proxy. If that is the case, add this to your gradle.properties file in your project root:

systemProp.http.proxyHost=your.proxy.com systemProp.http.proxyPort=8080 systemProp.https.proxyHost=your.proxy.com systemProp.https.proxyPort=8080

Replace "your.proxy.com" and "8080" with your actual proxy details from your IT department.

Frequently Asked Questions

Why does the error say "Could not resolve" but the library is in my build.gradle file?

The library is listed in your code, but Gradle cannot download it from any repository. This usually means the repository is missing, the version does not exist, or your network cannot reach the repository server. Check that you have both google() and mavenCentral() in your repositories block, and that the version number matches what the library actually publishes.

Will deleting the .gradle folder fix this?

Deleting the .gradle folder (hidden in your user home directory) clears all cached downloads and forces Gradle to re-download everything. This works sometimes, but "Invalidate Caches" in Android Studio is safer and does the same thing. Only delete .gradle manually if you are comfortable with hidden folders and command line tools.

What if the error mentions a transitive dependency I did not add?

A transitive dependency is a library that another library needs. If library A needs library B, and you add library A, Gradle automatically tries to get library B too. If library B cannot be resolved, the error mentions it even though you never wrote it in your code. The fix is the same: check repositories, check versions, and make sure the repository hosting library B is listed in your build.gradle.

Can I build offline if I have already downloaded the dependencies?

Yes. Go to File > Settings (or Android Studio > Preferences on Mac) > Build, Execution, Deployment > Gradle and check the box for "Offline mode". This tells Gradle to use only cached downloads and not try to reach the internet. Use this only if you have already downloaded all dependencies successfully once before.

What does "Could not resolve" mean for a local library I created?

If the error mentions a library you built yourself (not from Maven), check that the library module exists in your project and that your app's build.gradle correctly references it. The line should look like implementation project(':libraryname'). Make sure the library name matches exactly, including capitalization.