title: Infra or precheck error: No class with name found
body: <p>I do not understand why I am getting this error.<br>
  Can any one explain what is the meaning of this error? What causes this error and how to resolve one.</p>
  
  <p>Error: </p>
  
  <blockquote>
    <p>Infra or precheck error: No class with name found</p>
  </blockquote>
  
  <p>Here is my code: </p>
  
  <pre><code>import java.util.*;
  
  class TestClass {
      public static void main(String args[] ) throws Exception {
          Scanner sc = new Scanner(System.in);
          int n= sc.nextInt();
          String str;
          String tstr;
          str=sc.nextLine();
          tstr=sc.nextLine();
  
          char [] s = new char[n];
          char [] t = new char[n];
          for(int i=0;i&lt;str.length();i++){
              s[i]=str.charAt(i);
          }
          for(int i=0;i&lt;tstr.length();i++){
              t[i]=tstr.charAt(i);
  
          }
          int count=0;
          for(int i=0;i&lt;n;i++){
  
                  if(((s[i]+13)%90)&gt;t[i]){
                      count=count+t[i]-s[i];
  
                  }
                  else if(((s[i]+13)%90)&lt;t[i]){
                      count=count+t[i]-s[i]+13;
  
                  }
  
          }
          System.out.println(count);
      }
  }
  </code></pre>