IntelliJ：错误：java：错误：不支持发布版本 5

我用IntelliJ IDEA Ultimate 2019.3.1.每当我try 启动任何简单的Java Maven项目(甚至可能是一个简单的Hello World)时，我都会遇到以下错误:

Error:java: error: release version 5 not supported

通过终端运行java --version，我得到以下输出:

openjdk 11.0.5 2019-10-15
OpenJDK Runtime Environment (build 11.0.5+10-post-Ubuntu-0ubuntu1.1)
OpenJDK 64-Bit Server VM (build 11.0.5+10-post-Ubuntu-0ubuntu1.1, mixed mode, sharing)

通过终端运行javac --version，我得到以下输出:

javac 11.0.5

转到Java编译器的设置(如建议的here)，我看到:

我try 将"Target bytecode version"编辑为1.8，但我发现以下错误:

Error:(1, 26) java: package javafx.application does not exist
Error:(2, 20) java: package javafx.stage does not exist
Error:(4, 27) java: cannot find symbol
  symbol: class Application
Error:(12, 23) java: cannot find symbol
  symbol:   class Stage
  location: class Main
Error:(7, 9) java: cannot find symbol
  symbol:   method launch(java.lang.String[])
  location: class Main
Error:(11, 5) java: method does not override or implement a method from a supertype

将其更改为版本1.11时，会出现以下错误:

Error:java: Source option 5 is no longer supported. Use 6 or later.

你认为问题出在哪里？我该怎么解决呢？