You might be using 3rd party library who are using a different version of android support library. Use the following configuration to force all dependency libraries to use the same version.
Edit project's build.gradle
.
buildscript {
ext {
android_support_library_version = '27.1.1'
}
...
}
subprojects {
project.configurations.all {
resolutionStrategy.eachDependency { details ->
if (details.requested.group == 'com.android.support'
&& details.requested.name != 'multidex'
&& details.requested.name != 'multidex-instrumentation') {
details.useVersion android_support_library_version
}
}
}
}
References: