gradle problem in android studio

if creating this type in Android Studio Error:A problem occurred configuring project ':app'. Could not resolve all dependencies for configuration ':app:_debugApkCopy'. Could not find com.android.support:appcompat-v7:25.0.0. Required by: Thunders:app:unspecified Could not find com.android.support:design:25.0.0. Required by: Thunders:app:unspecified

• #متفرقه
• #how_to_fix_gradle_err
• #how_to_solve_gradle_p
• #gradle_problem_in_and