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我在PC端写了一个webservice用来操作SQL server数据库，并成功发布了

但是用android studio运行时候调用一直报错， 大佬们能帮看看吗？

I/System.out: 准备开启服务

D/NetworkSecurityConfig: No Network Security Config specified, using platform default

I/zygote: Background concurrent copying GC freed 8162(568KB) AllocSpace objects, 1(20KB) LOS objects, 49% free, 2MB/4MB, paused 1.469ms total 102.026ms

W/System.err: java.lang.IllegalArgumentException: is == null

at org.kxml2.io.KXmlParser.setInput(KXmlParser.java:1636)

at org.ksoap2.transport.Transport.parseResponse(Transport.java:117)

at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:275)

W/System.err: at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:118)

at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:113)

at com.example.appleladn.dailymeal.DeleteActivity.doDelete(DeleteActivity.java:67)

at com.example.appleladn.dailymeal.DeleteActivity.access$000(DeleteActivity.java:16)

at com.example.appleladn.dailymeal.DeleteActivity$1.run(DeleteActivity.java:50)

I/System.out: 调用WebService服务失败