I'm having problems when trying to build my app in unity

I’m having these issues in unity:
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•CommandInvokationFailure: Gradle build failed.
C:/Program Files/Android/Android Studio/jre\bin\java.exe -classpath “C:\Program Files\Unity\Hub\Editor\2018.2.1f1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-4.2.1.jar” org.gradle.launcher.GradleMain “-Dorg.gradle.jvmargs=-Xmx2048m” “assembleRelease”

stderr[

FAILURE: Build failed with an exception.

  • What went wrong:
    A problem occurred configuring root project ‘gradleOut’.

Could not resolve all files for configuration ‘:classpath’.
Could not find manifest-merger.jar (com.android.tools.build:manifest-merger:26.0.1).
Searched in the following locations:
https://jcenter.bintray.com/com/android/tools/build/manifest-merger/26.0.1/manifest-merger-26.0.1.jar
Could not find ddmlib.jar (com.android.tools.ddms:ddmlib:26.0.1).
Searched in the following locations:
https://jcenter.bintray.com/com/android/tools/ddms/ddmlib/26.0.1/ddmlib-26.0.1.jar
Could not find dvlib.jar (com.android.tools:dvlib:26.0.1).
Searched in the following locations:
https://jcenter.bintray.com/com/android/tools/dvlib/26.0.1/dvlib-26.0.1.jar
Could not find common.jar (com.android.tools:common:26.0.1).
Searched in the following locations:
https://jcenter.bintray.com/com/android/tools/common/26.0.1/common-26.0.1.jar

  • Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

  • Get more help at https://help.gradle.org

BUILD FAILED in 5s
]
stdout[

]
exit code: 1
UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg)
UnityEditor.Android.AndroidJavaTools.RunJava (System.String args, System.String workingdir, System.Action1 progress, System.String error) UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action1 progress)
Rethrow as GradleInvokationException: Gradle build failed
UnityEditor.Android.GradleWrapper.Run (UnityEditor.Android.AndroidJavaTools javaTools, System.String workingdir, System.String task, System.Action`1 progress)
UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
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•Build completed with a result of ‘Failed’
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
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•UnityEditor.BuildPlayerWindow+BuildMethodException: 2 errors
at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x0021f] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:187
at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x0007f] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:94
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)