Android studio无法运行虚拟机

Question

求大神们帮我看看，Androidstudio无法运行，之前装了最新版本是没问题的，后来想装之前的版本，结果出问题了，gradel出问题，后来又装回最新版本还是不对，尝试了各种方法，在新建项目的时候gradel build没问题了，之前一直贼慢，现在很快就好了，但是无法运行不知道为什么？

Answer 1

Execution failed for task ':app:mergeDebugResources'.
> Could not resolve all files for configuration ':app:_internal_aapt2_binary'.
   > Could not resolve com.android.tools.build:aapt2:4.1.2-6503028.
     Required by:
         project :app
      > Could not resolve com.android.tools.build:aapt2:4.1.2-6503028.
         > Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/aapt2/4.1.2-6503028/aapt2-4.1.2-6503028.pom'.
            > Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/build/aapt2/4.1.2-6503028/aapt2-4.1.2-6503028.pom'.
               > Connect to 127.0.0.1:80 [/127.0.0.1] failed: Connection refused: connect
      > Could not resolve com.android.tools.build:aapt2:4.1.2-6503028.
         > Could not get resource 'https://jcenter.bintray.com/com/android/tools/build/aapt2/4.1.2-6503028/aapt2-4.1.2-6503028.pom'.
            > Could not GET 'https://jcenter.bintray.com/com/android/tools/build/aapt2/4.1.2-6503028/aapt2-4.1.2-6503028.pom'.
               > Connect to 127.0.0.1:80 [/127.0.0.1] failed: Connection refused: connect