Android：添加数据绑定时出现NullPointerException

Question

现在，我可以解决它。我从布局xml中删除了一些标记。

.enter().append("rect")＆lt;＆lt;＆lt;＆lt;从所有布局xml中删除此标记。

<小时/>
我将数据绑定添加到我的android项目中。我从Gradle得到了 NullPointerException 。

<?xml version="1.0" encoding="utf-8"?>

如果我删除它（下面），我可以正常构建项目。

Information:Gradle tasks [:MaterialDesign:generateDebugSources, :MaterialDesign:generateDebugAndroidTestSources, :app:generateDebugSources, :app:generateDebugAndroidTestSources]
:MaterialDesign:preBuild UP-TO-DATE
:MaterialDesign:preDebugBuild UP-TO-DATE
:MaterialDesign:checkDebugManifest
:MaterialDesign:preDebugAndroidTestBuild UP-TO-DATE
:MaterialDesign:preDebugUnitTestBuild UP-TO-DATE
:MaterialDesign:preReleaseBuild UP-TO-DATE
:MaterialDesign:preReleaseUnitTestBuild UP-TO-DATE
:MaterialDesign:prepareComAndroidSupportSupportV42221Library UP-TO-DATE
:MaterialDesign:prepareDebugDependencies
:MaterialDesign:compileDebugAidl UP-TO-DATE 
.
.
.
:app:dataBindingProcessLayoutsDebug
line 1:0 extraneous input '?' expecting {COMMENT, SEA_WS, '<', PI}
line 1:0 mismatched input '?' expecting {COMMENT, SEA_WS, '<', PI}
Error:Execution failed for task ':app:dataBindingProcessLayoutsDebug'.
> java.lang.NullPointerException (no error message)
Information:BUILD FAILED
Information:Total time: 12.924 secs
Information:1 error
Information:0 warnings
Information:See complete output in console