title: cannot access ActivityCompatApi23
body: <pre><code>C:\Users\pramod pams\AndroidStudioProjects\LoginRegister3\app\src\main\java\com\pramod\loginregister\firstpage.java
  Error:(9, 8) error: cannot access ActivityCompatApi23
  class file for android.support.v4.app.ActivityCompatApi23 not found
  Error:(12, 5) error: method does not override or implement a method from a supertype
  Error:(14, 9) error: cannot find symbol variable super
  Error:(15, 9) error: cannot find symbol method setContentView(int)
  Error:(17, 39) error: cannot find symbol method findViewById(int)
  Error:(18, 38) error: cannot find symbol method findViewById(int)
  Error:(22, 53) error: not an enclosing class: firstpage
  Error:(23, 26) error: not an enclosing class: firstpage
  Error:(24, 17) error: cannot find symbol method finish()
  Error:(30, 54) error: not an enclosing class: firstpage
  Error:(31, 26) error: not an enclosing class: firstpage
  Error:(32, 17) error: cannot find symbol method finish()
  Note: Some input files use or override a deprecated API.
  Note: Recompile with -Xlint:deprecation for details.
  :app:compileDebugJavaWithJavac FAILED
  Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
  </code></pre>
  
  <blockquote>
    <p>Compilation failed; see the compiler error output for details.
    Information:BUILD FAILED
    Information:Total time: 1 mins 20.886 secs
    Information:13 errors
    Information:0 warnings
    Information:See complete output in console</p>
  </blockquote>