Sdkmanager "Error: Could not find or load main class com.android.sdklib.tool.sdkmanager.SdkManagerCli" on Windows

Question

I am trying to install Flutter without Android Studio and here is what I did:

• Installed Java 8
• Installed and Unzipped Flutter SDK to C:\src.
• Installed and Unzipped Android Command-line tools (sdkmanager) to C:\Android.
• Added the environment variables (ANDROID_HOME: C:\Android)

Now when I try to run sdkmanager to install Android SDK, I get this error:

"Error: Could not find or load main class com.android.sdklib.tool.sdkmanager.SdkManagerCli"

I have tried reinstalling Flutter sdk and the sdkmanager with no luck.

Here is Flutter Doctor's output:

sdkmanager error:

Answer 1

Open the sdkmanager.bat in a text editor and add echo %CLASSPATH% just below the CLASSPATH=%APP_HOME%\...\sdkmanager-classpath.jar. Then run sdkmanager --help which will echo the CLASSPATH of the required file. And check whether is it the valid path.

In my case, it was the wrong path,

It said my sdkmanger-classpath.jar is in lib folder. But it was not! It was actually inside the lib/_ folder. So as the simple solution what I did was copy the content in side lib/_ folder to lib. Then it worked fine!