If you want not to use dimensions you should use this line
android {
compileSdkVersion 24
...
flavorDimensions "default"
...
}
but if you want ti use dimensions you should declare your dimension name first and then use this name after THIS example is from the documentations:
android {
...
buildTypes {
debug {...}
release {...}
}
// Specifies the flavor dimensions you want to use. The order in which you
// list each dimension determines its priority, from highest to lowest,
// when Gradle merges variant sources and configurations. You must assign
// each product flavor you configure to one of the flavor dimensions.
flavorDimensions "api", "mode"
productFlavors {
demo {
// Assigns this product flavor to the "mode" flavor dimension.
dimension "mode"
...
}
full {
dimension "mode"
...
}
// Configurations in the "api" product flavors override those in "mode"
// flavors and the defaultConfig block. Gradle determines the priority
// between flavor dimensions based on the order in which they appear next
// to the flavorDimensions property above--the first dimension has a higher
// priority than the second, and so on.
minApi24 {
dimension "api"
minSdkVersion 24
// To ensure the target device receives the version of the app with
// the highest compatible API level, assign version codes in increasing
// value with API level. To learn more about assigning version codes to
// support app updates and uploading to Google Play, read Multiple APK Support
versionCode 30000 + android.defaultConfig.versionCode
versionNameSuffix "-minApi24"
...
}
minApi23 {
dimension "api"
minSdkVersion 23
versionCode 20000 + android.defaultConfig.versionCode
versionNameSuffix "-minApi23"
...
}
minApi21 {
dimension "api"
minSdkVersion 21
versionCode 10000 + android.defaultConfig.versionCode
versionNameSuffix "-minApi21"
...
}
}
}
...