Duplicated classes found in modules classes.jar

There are two ways to fix your issue.

1. Excluding duplicated dependencies while implementation individually,

2. Excluding duplicated dependencies from every implementations in generic way.

Let's first understand the problem :

Here, in your case artifact com.android.support is duplicated, because your app module uses version : 27.1.1 while your artifact com.cxpublic:cxense-android:1.0.1 is having internal dependency of com.android.support uses version : 22.2.0.

So, you should remove one of them manually (removing older or lower version is recommended). Let's try to remove it !

---

By first approach:

implementation ('com.cxpublic:cxense-android:1.0.1') {
    exclude group: "com.android.support", module: "support-v4"
}

Putting exclude for group com.android.support in our artifact com.cxpublic:cxense-android:1.0.1 will not get imported for support-v4 libraries when we use our implementation on this artifact.

So, issue would be resolved by manually putting this block to every artifact having this conflict.

By Second way:

We can remove included dependencies and replace them with one package with latest number. In our case, it is support-v4 with different version. So, go to the android block of app level build.gradle and put below block there to remove duplicated support-v4 from all artifacts, so that we can have distinct dependency.

android {
    // Some other stuffs
    configurations {
        all*.exclude module: 'support-v4' // This removes all other versions of `support-v4` if gets duplicated from all the artifacts.
    }
    // Rest of other stuffs
}

If there are duplicates, use exclude:

implementation ('com.cxpublic:cxense-android:1.0.1') {
    exclude group: "com.android.support", module: "support-v4"
}

Or remove implementation 'com.android.support:appcompat-v7:27.1.1' in favour of support-v4.

See: https://discuss.gradle.org/t/how-do-i-exclude-specific-transitive-dependencies-of-something-i-depend-on/17991