object(Zend_Cache_Exception)#24 (7) {
  ["_previous:private"]=>
  NULL
  ["message:protected"]=>
  string(59) "Invalid id or tag 'show_3967.' : must use only [a-zA-Z0-9_]"
  ["string:private"]=>
  string(0) ""
  ["code:protected"]=>
  int(0)
  ["file:protected"]=>
  string(57) "D:\Inetpub\ibdb.com\sites\ibdb.com\library\Zend\Cache.php"
  ["line:protected"]=>
  int(208)
  ["trace:private"]=>
  array(3) {
    [0]=>
    array(6) {
      ["file"]=>
      string(62) "D:\Inetpub\ibdb.com\sites\ibdb.com\library\Zend\Cache\Core.php"
      ["line"]=>
      int(603)
      ["function"]=>
      string(14) "throwException"
      ["class"]=>
      string(10) "Zend_Cache"
      ["type"]=>
      string(2) "::"
      ["args"]=>
      array(1) {
        [0]=>
        string(59) "Invalid id or tag 'show_3967.' : must use only [a-zA-Z0-9_]"
      }
    }
    [1]=>
    array(6) {
      ["file"]=>
      string(62) "D:\Inetpub\ibdb.com\sites\ibdb.com\library\Zend\Cache\Core.php"
      ["line"]=>
      int(420)
      ["function"]=>
      string(16) "_validateIdOrTag"
      ["class"]=>
      string(15) "Zend_Cache_Core"
      ["type"]=>
      string(2) "::"
      ["args"]=>
      array(1) {
        [0]=>
        string(10) "show_3967."
      }
    }
    [2]=>
    array(6) {
      ["file"]=>
      string(49) "D:\Inetpub\ibdb.com\sites\ibdb.com\production.php"
      ["line"]=>
      int(28)
      ["function"]=>
      string(6) "remove"
      ["class"]=>
      string(15) "Zend_Cache_Core"
      ["type"]=>
      string(2) "->"
      ["args"]=>
      array(1) {
        [0]=>
        string(10) "show_3967."
      }
    }
  }
}

Fatal error: Uncaught exception 'Zend_Cache_Exception' with message 'Invalid id or tag 'show_3967.' : must use only [a-zA-Z0-9_]' in D:\Inetpub\ibdb.com\sites\ibdb.com\library\Zend\Cache.php:208
Stack trace:
#0 D:\Inetpub\ibdb.com\sites\ibdb.com\library\Zend\Cache\Core.php(603): Zend_Cache::throwException('Invalid id or t...')
#1 D:\Inetpub\ibdb.com\sites\ibdb.com\library\Zend\Cache\Core.php(296): Zend_Cache_Core::_validateIdOrTag('show_3967.')
#2 D:\Inetpub\ibdb.com\sites\ibdb.com\library\Zend\Cache\Frontend\Output.php(63): Zend_Cache_Core->load('show_3967.', false)
#3 D:\Inetpub\ibdb.com\sites\ibdb.com\production.php(34): Zend_Cache_Frontend_Output->start('show_3967.')
#4 {main}
  thrown in D:\Inetpub\ibdb.com\sites\ibdb.com\library\Zend\Cache.php on line 208