Call to a member function getCompilerInfo() on nullobject(Error)#13 (7) {
  ["message":protected]=>
  string(51) "Call to a member function getCompilerInfo() on null"
  ["string":"Error":private]=>
  string(0) ""
  ["code":protected]=>
  int(0)
  ["file":protected]=>
  string(53) "/var/www/html/sky/function/problem/problem_submit.php"
  ["line":protected]=>
  int(35)
  ["trace":"Error":private]=>
  array(3) {
    [0]=>
    array(4) {
      ["file"]=>
      string(46) "/var/www/html/sky/function/problem/problem.php"
      ["line"]=>
      int(46)
      ["function"]=>
      string(26) "SKYOJ\Problem\submitHandle"
      ["args"]=>
      array(0) {
      }
    }
    [1]=>
    array(4) {
      ["file"]=>
      string(36) "/var/www/html/sky/function/SkyOJ.php"
      ["line"]=>
      int(211)
      ["function"]=>
      string(27) "SKYOJ\Problem\ProblemHandle"
      ["args"]=>
      array(0) {
      }
    }
    [2]=>
    array(6) {
      ["file"]=>
      string(27) "/var/www/html/sky/index.php"
      ["line"]=>
      int(12)
      ["function"]=>
      string(3) "run"
      ["class"]=>
      string(12) "SKYOJ\_SkyOJ"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(0) {
      }
    }
  }
  ["previous":"Error":private]=>
  NULL
}