I haven’t opened the Android project for a while; Open compilation and report an error
w: Runtime JAR files in the classpath should have the same version. These files were found in the classpath:
e: D:/software/Gradle_ workplace/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-common/1.5.10/6b84d926e28493be69daf673e40076f89492ef7/kotlin-stdlib-common-1.5.10.jar!/ META-INF/kotlin-stdlib-common.kotlin_ Module: module was compiled with an incompatible version of kotlin. The binary version of its metadata is 1.5.1, expected version is 1.1.13.
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the final solution is:

add this dependency; Implementation “androidx. Core: core KTX: +”
remove it and you can compile it;

Feeling is conflict; Moreover, this feeling at the beginning of Android x is prone to conflict sometimes. After all, the dependence on the new package name feels unstable. If there is a problem in the future, just lean in this direction;

The boss who knows the problem can also give advice;

Environment:
kotlin version is 1.3.11
JDK is 1.8
gradle is 4.6
Android studio is 4.1.3