1. First check whether the dependencies in build.gradle have dependencies that do not specify a version (eg: compile 'com.android.support:recyclerview-v7:+')
Check to see if there is a //noinspection GradleCompatible comment in dependencies
If there is any, delete the comment of //noinspection GradleCompatible. At this time, there will be a line of dependency error, usually com.android.support:appcompat-v7 error
Deleting the above //noinspection GradleCompatible will find that the dependent V7 package prompts that the dependent version is inconsistent
At this time, change 'com.android.support:recyclerview-v7:+' ( note: the dependency is not specified version, the recyclerview here is just a demonstration ) to
compile 'com.android.support:recyclerview-v7:26.0.2'
then build it again
Note: my buildToolsVersion "26.0.2" is like this