'class file has wrong version 52.0, should be 50.0' - class file has wrong version 52.0, should be 50.0

problem ：

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I'm trying to compile my project in IntelliJ idea.<\/i> I'm trying to use IntelliJ idea Compile my project .<\/b> I'm using a class in an external jar file and on compilation receiving the following error.<\/i> I'm outside jar Use a class in the file , And receive the following error when compiling .<\/b><\/p>

Class file has wrong version 52.0, should be 50.0

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Solution ：

Reference resources ： https://stackoom.com/en/question/1uF8t