android - Android Studio为什么不允许您创建SliceProvider？

Error executing FreeMarker template FreeMarker template error: The following has evaluated to null or missing: ==> activityClass [in template "root://other/SliceProvider/root/src/app_package/SliceProvider.java.ftl" at line 86, column 61] Tip: If the failing expression is known to be legally null/missing, either specify a default value with 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 parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)?? The failing instruction (FTL stack trace): ---------- ==> ${activityClass} [in template "root://other/SliceProvider/root/src/app_package/SliceProvider.java.ftl" at line 86, column 59] ---------- Java stack trace (for programmers): ---------- freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...] at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:98) at freemarker.core.EvalUtil.coerceModelToString(EvalUtil.java:382) at freemarker.core.Expression.evalAndCoerceToString(Expression.java:115) at freemarker.core.DollarVariable.accept(DollarVariable.java:76) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.MixedContent.accept(MixedContent.java:93) at freemarker.core.Environment.visit(Environment.java:265) at freemarker.core.Environment.process(Environment.java:243) at freemarker.template.Template.process(Template.java:277) at com.android.tools.idea.templates.FreemarkerUtils.processFreemarkerTemplate(FreemarkerUtils.java:98) at com.android.tools.idea.templates.recipe.DefaultRecipeExecutor.instantiate(DefaultRecipeExecutor.java:267) at com.android.tools.idea.templates.recipe.Recipe$InstantiateInstruction.execute(Recipe.java:172) at com.android.tools.idea.templates.recipe.Recipe.executeInstructions(Recipe.java:120) at com.android.tools.idea.templates.recipe.Recipe.execute(Recipe.java:105) at com.android.tools.idea.templates.Template$4.process(Template.java:599) at com.android.tools.idea.templates.FreemarkerUtils.processFreemarkerTemplate(FreemarkerUtils.java:104) at com.android.tools.idea.templates.Template.executeRecipeFile(Template.java:588) at com.android.tools.idea.templates.Template.access$200(Template.java:81) at com.android.tools.idea.templates.Template$3.startElement(Template.java:550) at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source) at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source) at com.android.tools.idea.templates.Template.processXml(Template.java:515) at com.android.tools.idea.templates.Template.processFile(Template.java:499) at com.android.tools.idea.templates.Template.lambda$doRender$2(Template.java:399) at com.android.tools.idea.templates.Template$1.run(Template.java:378) at com.intellij.openapi.application.RunResult.run(RunResult.java:35) at com.intellij.openapi.command.WriteCommandAction.lambda$null$1(WriteCommandAction.java:265) at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1038) at com.intellij.openapi.command.WriteCommandAction.lambda$performWriteCommandAction$2(WriteCommandAction.java:264) at com.intellij.openapi.command.WriteCommandAction.lambda$doExecuteCommand$4(WriteCommandAction.java:322) at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:139) at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:107) at com.intellij.openapi.command.WriteCommandAction.doExecuteCommand(WriteCommandAction.java:324) at com.intellij.openapi.command.WriteCommandAction.performWriteCommandAction(WriteCommandAction.java:262) at com.intellij.openapi.command.WriteCommandAction.execute(WriteCommandAction.java:244) at com.android.tools.idea.templates.Template.runWriteCommandAction(Template.java:380) at com.android.tools.idea.templates.Template.doRender(Template.java:398) at com.android.tools.idea.templates.Template.render(Template.java:242) at com.android.tools.idea.npw.model.RenderTemplateModel$FreeMarkerTemplateRenderer.renderTemplate(RenderTemplateModel.java:344) at com.android.tools.idea.npw.model.RenderTemplateModel$FreeMarkerTemplateRenderer.doDryRun(RenderTemplateModel.java:260) at com.android.tools.idea.npw.model.MultiTemplateRenderer.countDown(MultiTemplateRenderer.java:156) at com.android.tools.idea.npw.model.MultiTemplateRenderer.requestRender(MultiTemplateRenderer.java:120) at com.android.tools.idea.npw.model.RenderTemplateModel.handleFinished(RenderTemplateModel.java:208) at com.android.tools.idea.wizard.model.ModelWizard.handleFinished(ModelWizard.java:403) at com.android.tools.idea.wizard.model.ModelWizard.goForward(ModelWizard.java:331) at com.android.tools.idea.wizard.model.ModelWizardDialog$FinishAction.doAction(ModelWizardDialog.java:311) at com.intellij.openapi.ui.DialogWrapper$DialogWrapperAction.actionPerformed(DialogWrapper.java:1840) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6548) at javax.swing.JComponent.processMouseEvent(JComponent.java:3325) at java.awt.Component.processEvent(Component.java:6313) at java.awt.Container.processEvent(Container.java:2237) at java.awt.Component.dispatchEventImpl(Component.java:4903) at java.awt.Container.dispatchEventImpl(Container.java:2295) at java.awt.Component.dispatchEvent(Component.java:4725) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467) at java.awt.Container.dispatchEventImpl(Container.java:2281) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4725) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764) at java.awt.EventQueue.access$500(EventQueue.java:98) at java.awt.EventQueue$3.run(EventQueue.java:715) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue$4.run(EventQueue.java:737) at java.awt.EventQueue$4.run(EventQueue.java:735) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:734) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:817) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:754) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:394) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:109) at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:190) at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:235) at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:233) at java.security.AccessController.doPrivileged(Native Method) at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:233) at java.awt.Dialog.show(Dialog.java:1077) at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl$MyDialog.show(DialogWrapperPeerImpl.java:698) at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl.show(DialogWrapperPeerImpl.java:430) at com.intellij.openapi.ui.DialogWrapper.invokeShow(DialogWrapper.java:1690) at com.intellij.openapi.ui.DialogWrapper.show(DialogWrapper.java:1639) at com.android.tools.idea.actions.NewAndroidComponentAction.actionPerformed(NewAndroidComponentAction.java:155) at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:255) at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:272) at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$0(ActionMenuItem.java:304) at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:307) at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:106) at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:294) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$0(ActionMenuItem.java:114) at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88) at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:111) at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:120) at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:122) at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:114) at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:529) at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:49) at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:549) at java.awt.Component.processMouseEvent(Component.java:6548) at javax.swing.JComponent.processMouseEvent(JComponent.java:3325) at java.awt.Component.processEvent(Component.java:6313) at java.awt.Container.processEvent(Container.java:2237) at java.awt.Component.dispatchEventImpl(Component.java:4903) at java.awt.Container.dispatchEventImpl(Container.java:2295) at java.awt.Component.dispatchEvent(Component.java:4725) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467) at java.awt.Container.dispatchEventImpl(Container.java:2281) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4725) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764) at java.awt.EventQueue.access$500(EventQueue.java:98) at java.awt.EventQueue$3.run(EventQueue.java:715) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue$4.run(EventQueue.java:737) at java.awt.EventQueue$4.run(EventQueue.java:735) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:734) at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:817) at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:754) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:394) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)