用mybatisX生成XML代码时报错，xml模板出问题了！！！

# 问题描述  如题
操作系统：win10

插件版本:1.5.4
![输入图片说明](https://foruda.gitee.com/images/1661496223414399800/7479567d_8566987.png "屏幕截图")

idea版本:IDEA 2022.1.4 ultimate

问题描述: 我在使用mybatisX自带的逆向生成工具生成xml模板时，提示报错

# 重现步骤
idea里右键database的库表，点击`mybatisX-Generator`，template选项不管选择哪一个都会报错，我这里只生成了xml文件
![输入图片说明](https://foruda.gitee.com/images/1661496481701295198/346612af_8566987.png "屏幕截图")

# 报错信息
![输入图片说明](https://foruda.gitee.com/images/1661496507157573671/6a7be144_8566987.png "屏幕截图")
```log
Error executing FreeMarker template

FreeMarker template error:
The following has evaluated to null or missing:
==> mapperInterface  [in template "template" at line 5, column 22]

----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
	- Failed at: ${mapperInterface.packageName}  [in template "template" at line 5, column 20]
----

Java stack trace (for programmers):
----
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
	at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:134)
	at freemarker.core.UnexpectedTypeException.newDescriptionBuilder(UnexpectedTypeException.java:85)
	at freemarker.core.UnexpectedTypeException.<init>(UnexpectedTypeException.java:48)
	at freemarker.core.NonHashException.<init>(NonHashException.java:49)
	at freemarker.core.Dot._eval(Dot.java:48)
	at freemarker.core.Expression.eval(Expression.java:101)
	at freemarker.core.DollarVariable.calculateInterpolatedStringOrMarkup(DollarVariable.java:100)
	at freemarker.core.DollarVariable.accept(DollarVariable.java:63)
	at freemarker.core.Environment.visit(Environment.java:331)
	at freemarker.core.Environment.visit(Environment.java:337)
	at freemarker.core.Environment.process(Environment.java:310)
	at freemarker.template.Template.process(Template.java:383)
	at com.baomidou.plugin.idea.mybatisx.generate.template.FreeMakerFormatter.getFormattedContent(FreeMakerFormatter.java:76)
	at org.mybatis.generator.api.GeneratedJavaFile.getFormattedContent(GeneratedJavaFile.java:46)
	at com.baomidou.plugin.idea.mybatisx.generate.template.FreemarkerFile.getFormattedContent(FreemarkerFile.java:24)
	at com.baomidou.plugin.idea.mybatisx.generate.plugin.IntellijMyBatisGenerator.writeGeneratedJavaFile(IntellijMyBatisGenerator.java:240)
	at com.baomidou.plugin.idea.mybatisx.generate.plugin.IntellijMyBatisGenerator.generate(IntellijMyBatisGenerator.java:155)
	at com.baomidou.plugin.idea.mybatisx.generate.template.GenerateCode.generate(GenerateCode.java:142)
	at com.baomidou.plugin.idea.mybatisx.generate.action.MybatisGeneratorMainAction.generateCode(MybatisGeneratorMainAction.java:83)
	at com.baomidou.plugin.idea.mybatisx.generate.action.MybatisGeneratorMainAction.actionPerformed(MybatisGeneratorMainAction.java:61)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.lambda$performActionDumbAwareWithCallbacks$4(ActionUtil.java:235)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.performDumbAwareWithCallbacks(ActionUtil.java:256)
	at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAwareWithCallbacks(ActionUtil.java:235)
	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$performAction$0(ActionMenuItem.java:289)
	at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:233)
	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.performAction(ActionMenuItem.java:281)
	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:296)
	at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
	at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$2(ActionMenuItem.java:111)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:106)
	at com.intellij.openapi.application.TransactionGuardImpl.performUserActivity(TransactionGuardImpl.java:95)
	at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:111)
	at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:540)
	at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:570)
	at java.desktop/java.awt.Component.processMouseEvent(Component.java:6654)
	at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3345)
	at java.desktop/java.awt.Component.processEvent(Component.java:6419)
	at java.desktop/java.awt.Container.processEvent(Container.java:2263)
	at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5029)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4861)
	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
	at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2793)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4861)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:778)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:751)
	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:749)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:748)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:898)
	at com.intellij.ide.IdeEventQueue.dispatchMouseEvent(IdeEventQueue.java:820)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:743)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:439)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:803)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:438)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:119)
	at com.intellij.ide.IdeEventQueue.performActivity(IdeEventQueue.java:604)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:436)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:873)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:484)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)

```

baomidou/MybatisX

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