Issue building my game for Android

Here are the two error messages I receive (in full) on build attempt:

 CommandInvokationFailure: Failed to build apk.
 C:/Users/Matthew/Desktop/javafolder\bin\java.exe -Xmx2048M -Dcom.android.sdkmanager.toolsdir="C:/Users/Matthew/Desktop/androidsdk\tools" -Dfile.encoding=UTF8 -jar "C:\Program Files\Unity\Editor\Data\PlaybackEngines\AndroidPlayer/Tools\sdktools.jar" -
 
 stderr[
 Exception in thread "main" java.lang.reflect.InvocationTargetException
     at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
     at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     at java.base/java.lang.reflect.Method.invoke(Method.java:564)
     at SDKMain.main(SDKMain.java:130)
 Caused by: java.lang.NoClassDefFoundError: sun/misc/BASE64Encoder
     at com.android.sdklib.internal.build.SignedJarBuilder.<init>(SignedJarBuilder.java:177)
     at com.android.sdklib.build.ApkBuilder.init(ApkBuilder.java:446)
     at com.android.sdklib.build.ApkBuilder.<init>(ApkBuilder.java:422)
     at com.android.sdklib.build.ApkBuilder.<init>(ApkBuilder.java:362)
     at UnityApkBuilder.<init>(UnityApkBuilder.java:214)
     at UnityApkBuilder.main(UnityApkBuilder.java:34)
     ... 5 more
 Caused by: java.lang.ClassNotFoundException: sun.misc.BASE64Encoder
     at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:466)
     at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:563)
     at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)
     ... 11 more
 ]
 stdout[
 
 ]
 exit code: 1
 UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
 UnityEditor.Android.AndroidSDKTools.RunCommandInternal (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
 UnityEditor.Android.AndroidSDKTools.RunCommandSafe (System.String javaExe, System.String sdkToolsDir, System.String[] sdkToolCommand, Int32 memoryMB, System.String workingdir, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
 UnityEditor.HostView:OnGUI()

 UnityEditor.BuildPlayerWindow+BuildMethodException: Build failed with errors.
   at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x001b9] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:162 
   at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x00050] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:83 
 UnityEditor.HostView:OnGUI()