每次我运行任何sdkmanager时，我都会不断收到此错误，而我完全不确定该怎么做：
Warning: Could not create settings java.lang.IllegalArgumentException
at
com.android.sdklib.tool.sdkmanager.SdkManagerCliSettings.<init>(SdkManagerCliSettings.java:428)
at
com.android.sdklib.tool.sdkmanager.SdkManagerCliSettings.createSettings(SdkManagerCliSettings.java:152)
at
com.android.sdklib.tool.sdkmanager.SdkManagerCliSettings.createSettings(SdkManagerCliSettings.java:134)
at
com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:57)
at
com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
Usage: sdkmanager [--uninstall] [<common args>]
[--package_file=<file>] [<packages>...] sdkmanager --update [<common
args>] sdkmanager --list [<common args>] sdkmanager --licenses
[<common args>] sdkmanager --version
With --install (optional), installs or updates packages.
By default, the listed packages are installed or (if already installed)
updated to the latest version. With --uninstall, uninstall the listed packages.
<package> is a sdk-style path (e.g. "build-tools;23.0.0" or "platforms;android-23").
<package-file> is a text file where each line is a sdk-style path of a package to install or uninstall.
Multiple --package_file arguments may be specified in combination with explicit paths.
With --update, all installed packages are updated to the latest version.
With --list, all installed and available packages are printed out.
With --licenses, show and offer the option to accept licenses for all available packages that have not already been accepted.
With --version, prints the current version of sdkmanager.
Common Arguments:
--sdk_root=<sdkRootPath>: Use the specified SDK root instead of the SDK containing this tool
--channel=<channelId>: Include packages in channels up to <channelId>.
Common channels are:
0 (Stable), 1 (Beta), 2 (Dev), and 3 (Canary).
--include_obsolete: With --list, show obsolete packages in the
package listing. With --update, update obsolete
packages as well as non-obsolete.
--no_https: Force all connections to use http rather than https.
--proxy=<http | socks>: Connect via a proxy of the given type.
--proxy_host=<IP or DNS address>: IP or DNS address of the proxy to use.
--proxy_port=<port #>: Proxy port to connect to.
--verbose: Enable verbose output.
* If the env var REPO_OS_OVERRIDE is set to "windows", "macosx", or "linux", packages will be downloaded for that OS.
我已将sdk设置为路径变量，并且我正在运行Java8。如果您有任何见解，请告诉我。