Emulator

Here's the error. I don't know much about synchronization operations.

java.lang.RuntimeException: Unable to start activity ComponentInfo{org.dolphinemu.dolphinemu.debug/org.dolphinemu.dolphinemu.activities.ConvertActivity}: java.lang.NullPointerException: Attempt to do a synchronize operation on a null object
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3676)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3813)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2308)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7898)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
Caused by: java.lang.NullPointerException: Attempt to do a synchronize operation on a null object
at org.dolphinemu.dolphinemu.services.GameFileCacheManager.addOrGet(GameFileCacheManager.java:168)
at org.dolphinemu.dolphinemu.fragments.ConvertFragment.onCreate(ConvertFragment.java:143)
at androidx.fragment.app.Fragment.performCreate(Fragment.java:3090)
at androidx.fragment.app.FragmentStateManager.create(FragmentStateManager.java:475)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:257)
at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:113)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1424)
at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2968)
at androidx.fragment.app.FragmentManager.dispatchCreate(FragmentManager.java:2875)
at androidx.fragment.app.FragmentController.dispatchCreate(FragmentController.java:252)
at androidx.fragment.app.FragmentActivity.onCreate(FragmentActivity.java:220)
at org.dolphinemu.dolphinemu.activities.ConvertActivity.onCreate(ConvertActivity.java:35)
at android.app.Activity.performCreate(Activity.java:8290)
at android.app.Activity.performCreate(Activity.java:8269)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1384)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3657)