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一、场景

1、IDEA编译Java文件报错

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二、报错信息

Error:Kotlin: Module was compiled with an incompatible version of Kotlin. The binary version of its metadata is 1.6.0, expected version is 1.1.15.
Warning:Kotlin: Some JAR files in the classpath have the Kotlin Runtime library bundled into them. This may cause difficult to debug problems if there's a different version of the Kotlin Runtime library in the classpath. Consider removing these libraries from the classpath

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三、重现步骤

1、先编译一遍项目

2、将其中一个Java文件从原目录移动到其他目录

3、再次编译

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四、原因

1、在第一次编译后，原目录会生成class文件

2、将Java文件从原目录移动到其他目录后再次编译，会在新目录再次生成对应的class文件，这时再原目录和新目录都会生成同样的class文件，导致冲突

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五、解决

Rebuild Project即可，Rebuild Project会先删除先前编译的class