没有org.apache.http.legacy.jar我看到了这些Proguard错误：
Proguard returned with error code 1. See console
Warning: com.google.android.gms.internal.ads.zzah: can't find referenced class org.apache.http.Header
Warning: com.google.android.gms.internal.ads.zzah: can't find referenced class org.apache.http.HttpEntity
Warning: com.google.android.gms.internal.ads.zzah: can't find referenced class org.apache.http.HttpResponse
Warning: com.google.android.gms.internal.ads.zzah: can't find referenced class org.apache.http.StatusLine
Warning: there were 33 unresolved references to classes or interfaces.
添加org.apache.http.legacy.jar
Proguard returned with error code 1. See console
Note: there were 7 duplicate class definitions.
(http://proguard.sourceforge.net/manual/troubleshooting.html#duplicateclass)
Warning: library class org.apache.http.conn.scheme.LayeredSocketFactory extends or implements program class org.apache.http.conn.scheme.SocketFactory
Warning: library class android.webkit.WebView depends on program class android.net.http.SslCertificate
Warning: library class android.webkit.WebView depends on program class android.net.http.SslCertificate
Warning: library class android.webkit.WebViewClient depends on program class android.net.http.SslError
Warning: there were 4 instances of library classes depending on program classes.
我该如何解决这个问题？