请问出现【both query and delegate are null】这个错误的原因是什么？

Jmix
#1 
java.lang.IllegalStateException: both query and delegate are null
	at io.jmix.ui.model.impl.CollectionLoaderImpl._load(CollectionLoaderImpl.java:82) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.model.impl.CollectionLoaderImpl.load(CollectionLoaderImpl.java:75) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.component.dataloadcoordinator.OnFrameOwnerEventLoadTrigger.load(OnFrameOwnerEventLoadTrigger.java:48) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.component.dataloadcoordinator.OnFrameOwnerEventLoadTrigger.lambda$new$0(OnFrameOwnerEventLoadTrigger.java:39) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.core.common.event.EventHub.publish(EventHub.java:170) ~[jmix-core-1.5.2.jar:na]
	at io.jmix.ui.screen.Screen.fireEvent(Screen.java:124) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.screen.UiControllerUtils.fireEvent(UiControllerUtils.java:58) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.sys.ScreensImpl.fireScreenBeforeShowEvent(ScreensImpl.java:1364) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.sys.ScreensImpl.show(ScreensImpl.java:357) ~[jmix-ui-1.5.2.jar:na]
	at io.jmix.ui.screen.Screen.show(Screen.java:306) ~[jmix-ui-1.5.2.jar:na]
    ……
#2

数据加载器（DataLoader）既没有配置 query 也没有配置加载代理（load delegate）

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