What does this mean?

2019-12-24 09:32:29.145 29318-29318/com.phoenixhospman.administrator E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.phoenixhospman.administrator, PID: 29318
    java.lang.BootstrapMethodError: Exception from call site #4 bootstrap method
        at okhttp3.internal.Util.<clinit>(Util.java:87)
        at okhttp3.internal.Util.skipLeadingAsciiWhitespace(Util.java:321)
        at okhttp3.HttpUrl$Builder.parse(HttpUrl.java:1313)
        at okhttp3.HttpUrl.get(HttpUrl.java:917)
        at retrofit2.Retrofit$Builder.baseUrl(Retrofit.java:492)
        at com.phoenixhospman.administrator.ManagerSecurityApi.<init>(ManagerSecurityApi.java:19)
        at com.phoenixhospman.administrator.ActivityMain.onCreate(ActivityMain.java:62)
        at android.app.Activity.performCreate(Activity.java:7353)
        at android.app.Activity.performCreate(Activity.java:7344)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1275)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3142)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3305)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1993)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:216)
        at android.app.ActivityThread.main(ActivityThread.java:7266)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:975)
     Caused by: java.lang.ClassCastException: Bootstrap method returned null
        at okhttp3.internal.Util.<clinit>(Util.java:87)
        at okhttp3.internal.Util.skipLeadingAsciiWhitespace(Util.java:321)
        at okhttp3.HttpUrl$Builder.parse(HttpUrl.java:1313)
        at okhttp3.HttpUrl.get(HttpUrl.java:917)
        at retrofit2.Retrofit$Builder.baseUrl(Retrofit.java:492)
        at com.phoenixhospman.administrator.ManagerSecurityApi.<init>(ManagerSecurityApi.java:19)
        at com.phoenixhospman.administrator.ActivityMain.onCreate(ActivityMain.java:62)
        at android.app.Activity.performCreate(Activity.java:7353)
        at android.app.Activity.performCreate(Activity.java:7344)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1275)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3142)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3305)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1993)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:216)
        at android.app.ActivityThread.main(ActivityThread.java:7266)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:975)