title: How to solve error compiling an arduino sketch?
body: <p>when I try to compile my Arduino UNO sketches using the official latest version Arduino software on Windows 7, I get this error</p>
  
  <pre><code>sketch\sketch_may21a.ino.cpp:1:21: fatal error: Arduino.h: No such file or directory
  #include &lt;Arduino.h&gt;
                   ^
  compilation terminated.
  exit status 1
  Error compiling for board Arduino/Genuino Uno.
  </code></pre>
  
  <p>what is the solution? What should i do?</p>