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Fix “Error running android: Gradle project sync failed. Please fix your project and try again” in Android Studio

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  • Difficulty Level : Expert
  • Last Updated : 15 May, 2021

In this article, we will see how to fix the error: “Gradle project sync failed. Please fix your project and try again” in Android Studio”. Before getting into the solution part, let’s discuss Gradle.

What is Gradle?

Gradle is an open-source build automation tool that automates the creation of applications. The various steps involved in creating an application are compiling, linking, packaging the code. This process becomes much easier and convenient with the help of build automation tools like Gradle.

Why is Gradle used in Android Studio?

Gradle is used in Android Studio to develop the .APK files which are non-other than the Apps on our mobile phones. The Gradle combines all the Java and XML files into dex files and with the help of its tools produces an APK file.

What does the error, Gradle project sync failed Please fix your project and try again” in Android Studio mean?

Gradle sync is one of the Gradle tasks which checks for all the dependencies present in the build. Gradle files. It then downloads all the specified versions online. Here the meaning of error is that the Gradle sync has not functioned properly i.e it has not downloaded all the required files for the project due to various reasons as discussed below.

Why does Gradle Project Sync Fail?

There are various reasons as to why Gradle Project Sync can Fail to compile or build the project files. Some of the reasons are listed below:

  • Lack of good internet connection: Gradle’s job is to install all the missing versions and packages online which are required for compiling the project, Hence it won’t be able to download in case of a bad internet connection
  • Problems in Gradle Compilation: Sometimes there might be issues in the Gradle Compiler, In that case, we have to take the extra effort to download and load the Gradle manually
  • Missing Files: There is a chance of  Gradle files getting misplaced. This can be solved by re-installing the required files.
  • Using the Proxy Servers: There was an issue with the syncing of the Gradle when Proxy Servers were turned on. Disabling it can help
  • Cache Memory: Android Studio uses Cache memory for fast and smooth usage of the app. Sometimes the cache gets corrupted due to which Gradle sync fails.

How to Fix the Error?

Method 1. Check your Internet Connectivity

Gradle Sync requires a stable internet connection for downloading various versions required for the project online. Hence it is always advised to check your internet connection before syncing your project in Android Studio.  

Method 2. Disabling the Proxy Server

Nowadays, there is an increase in the usage of the ProxyServer’s all around the world. It is basically used to increase the speed of the network and save on the network bandwidth. Usage of such  ProxyServers can affect the Gradle sync. Hence it is better to disable the proxy server while syncing the Gradle. You can also make sure whether you are using a ProxyServer in the following way.

Step 1: Press Windows+R and type inetcpl.cpl 

Windows + R

Step 2: You will observe a window displaying Internet Properties. Here click on the Connections tab present at the top.

Internet Properties

Step 3: Now press on the LAN settings, A LAN network settings window will be opened. 

LAN Settings

Step 4: Then under the proxy server settings, uncheck the box saying “Use a proxy server for your LAN” if you have checked it. This will Disable the ProxyServer. Now you can verify if the issues have been resolved.

Method 3. Invalidating the Cache Files/Restart

A cache is a temporary storage that is used to store the temporary data for accessing it quickly. Even Android Studio stores the cache for faster and smoother running of the app. However, there are instances where the cache can go corrupt, which can hinder the Gradle Sync Process. In order to solve this, we will delete or refresh all the cache in Android Studio in the following way.

  • Step 1. Firstly, we have to open Android Studio and go to the File > Press Invalidate Caches/Restart.
  • Step 2. Then wait for the process to complete which will be done in around 5 mins.
  • Step 3. Now, Restart Android Studio and check if the error still persists.

Invalidating the Cache

Method 4. Downloading a new version  of Gradle Files

Every time a  project is created, Gradle downloads the required versions and modules from the online distributions. However, sometimes there may be an issue with online distribution. To solve it is advised to download the Gradle distribution again manually. Here are the steps you can follow for downloading the files manually.

  • Step 1. Visit the official Gradle website and download the latest version of Gradle
  • Step 2. Now unzip the Gradle Files and place them in a Folder.
  • Step 3. Then open Android Studio and go to File > Settings > Build, Execution and Deployment > Gradle > Use Gradle from > Set the path of the downloaded Gradle.
  • Step 4. Now try syncing the  Gradle again and check if the error still persists.

Loading the Gradle manually

Method 5. Updating Packages in SDK Manager

Updating the packages present in SDK Manager can solve the problem.

  • Step 1. Open SDK Manager in Android Studio i.e: Tools > SDK Manager > Android SDK
  • Step 2. Now check the “-” sign beside any package and click OK to install the required packages 
  • Step 3. Then Reload the android studio and start syncing the Gradle and check whether the error is resolved 

Downloading the Required SDK Packages

Hence In this way, you can fix the “Error running android: Gradle project sync failed. Please fix your project and try again” in Android Studio.

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