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Error : Sync failed. Unresolved Android dependencies. Failed to resolve: com.android.support:appcompat-v7:28.1.1

Config:

 apply plugin: 'com.android.application'



    android {

        compileSdkVersion 28

        defaultConfig {

            applicationId "com.ercess.ercess_app1"

            minSdkVersion 15

            targetSdkVersion 28

            versionCode 1

            versionName "1.0"

            testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

        }

        buildTypes {

            release {

                minifyEnabled false

                proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

            }

        }

    }







    dependencies {

        implementation fileTree(dir: 'libs', include: ['*.jar'])

        implementation 'com.android.support.constraint:constraint-layout:1.1.2'

        implementation 'com.android.support:appcompat-v7:28.1.1'

        implementation 'com.squareup.picasso:picasso:2.71828'

        testImplementation 'junit:junit:4.12'

        androidTestImplementation 'com.android.support.test:runner:1.0.2'

        androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'



    }

How to resolve this?

Replace

implementation 'com.android.support:appcompat-v7:28.1.1

with

implementation 'com.android.support:appcompat-v7:28.0.0-rc01'

Currently, the most recent available release for appCompat is 28.0.0-rc01, you are trying to pull an unavailable version of appcompat library.

Root cause: The version 28.1.1 is not exist.

Solution: Use the latest stable version

implementation 'com.android.support:appcompat-v7:27.1.1'

or use latest unstable version

implementation 'com.android.support:appcompat-v7:28.0.0-rc01'

Please add these below dependencies to solve the issue, try it:

implementation 'com.android.support:support-v4:27.1.1'

implementation 'com.android.support:support-v13:27.1.1'

implementation 'com.android.support:design:27.1.1'

also change the version of AppCompat as:

implementation 'com.android.support:appcompat-v7:27.1.1'

AppCompat Sometimes doesn't work alone. Adding these might solve your issue.

you'd have to use api "com.android.support:appcompat-v7:27.1.1" -

or the later (future) api "androidx.appcompat:appcompat:1.0.0-alpha1"
from androidx.

using "release candidates" and "alpha versions" is discouraged, because these are not well tested.

just see the official documentation ...it recommends 27.1.1.

replace

implementation 'com.android.support:appcompat-v7:28.1.1' 

with

implementation 'com.android.support:appcompat-v7:28.0.0-rc02'

I solved this by trial and error and using some of the answers above.

I changed the appcompat to a lower version "com.android.support:appcompat-v7:27.1.0"
along with changing

compileSdkVersion 27

and
targetSdkVersion 27

I'm still getting warnings but Picasso should now run.