resource error in android studio after update: No Resource Found

Change the appcompat version in your build.gradle file back to 22.2.1 (or whatever you were using before).

You need to set compileSdkVersion to 23.

Since API 23 Android removed the deprecated Apache Http packages, so if you use them for server requests, you'll need to add useLibrary 'org.apache.http.legacy' to build.gradle as stated in this link:

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.0"
    ...

    //only if you use Apache packages
    useLibrary 'org.apache.http.legacy'
}