ERROR: Could not find com.android.support:appcompat-v7:23.2.1.

[SachiniEMSPE]

I downloaded this to Android Studio 3.5 and initially faced the issue of not having 'STUDY_ID'.
I was able to solve it by adding new ID in gradle.properties and also creating an account in https://www.synapse.org/.
Then I faced the below issue.
I tried upgrading SDK too. But still I'm getting this error.
May I know how to get rid of this.
Thank you !

ERROR: Could not find com.android.support:appcompat-v7:23.2.1.
Required by:
    ReasearchStackTest_example:app:unspecified
    ReasearchStackTest_example:app:unspecified > org.researchstack:skin:1.0.0.rc3 > org.researchstack:backbone:1.0.0.rc3
Search in build.gradle files

[JohannesOehm]

I was able to resolve this issue adding Google Maven to the root build.gradle

allprojects {
    repositories {
        jcenter()
        maven { url "https://jitpack.io" } // for MPAndroidChard, not on jcenter yet
        maven { url "https://maven.google.com" } // for appcompat
        mavenLocal()        // for updates to local rstack
    }
}

[limdaihwan]

asd