title: Exception in thread "main" java.util.MissingFormatArgumentException: Format specifier '10s'
body: <p>I'm no doubt missing something really obvious here but I can't figure it out. Any help would be appreciated. The mistake is coming from here:</p>
  
  <pre><code>package B00166353_Grades;
  
  public class Student{
      String name,banner;
  
      public Student(String name,String banner){
          this.name=name;
          this.banner=banner;
      }
  
      public String toString(){
          String productDetails=new String();
          productDetails+=String.format("%-20s%10.2s%10s",this.name,this.banner);
          return productDetails;
      }
  }
  </code></pre>