Unable to resolve dependency for ':app@debug/c

Question

Newly installed Android studio 3.1.3 is giving strange dependencies error when making a new project and compiling for very first time.

A similar question that didn't help resolve the problem.

Event Logs:

Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.
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Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.
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Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.
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Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.
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Unable to resolve dependency for ':app@release/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:28.0.0-alpha3.
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Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.android.support.constraint:constraint-layout:1.1.2.
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ScreenShot:

this problem happened to me several times and forcing https or http didn't resolve it either

Answer 1

I had this issue with offline mode enable. I disabled offline mode and synced.

• Open the Preferences, by clicking File > Settings.
• In the left pane, click Build, Execution, Deployment > Gradle.
• Uncheck the Offline work.
• Apply changes and sync project again.

Answer 2

I just figured out how to remove this gradle error, follow the following steps.

1- Go to "File". 2- Click on Invalidate Cache/ Restart. 3- Again click on Invalidate Cache / Restart(On dialoge window).

Let the gradle build without any interruption.

Thank You! Regards, hope this will help.

Answer 3

I was unable to find the root cause of the issue but got a workaround. I started by setting my the java home variable as such.

• vi ~/.bash_profile (this is for macs only. bash profiles are different on linux)
• type the letter i for insert and then set the JAVA_HOME variable as such
• export JAVA_HOME=/Applications/Android\Studio.app/Contents/jre/jdk/Contents/Home/
• quit the vi editor with esc then type :wq
• Restart the computer
• Voila! Your android studio projects should build without any qualms