PDOException Object
(
    [message:protected] => SQLSTATE[42000]: Syntax error or access violation: 1068 Multiple primary key defined
    [string:Exception:private] => 
    [code:protected] => 42000
    [file:protected] => /home/mobilslf/public_html/lib/Varien/Db/Adapter/Pdo/Mysql.php
    [line:protected] => 277
    [trace:Exception:private] => Array
        (
            [0] => Array
                (
                    [file] => /home/mobilslf/public_html/lib/Varien/Db/Adapter/Pdo/Mysql.php
                    [line] => 277
                    [function] => query
                    [class] => PDO
                    [type] => ->
                    [args] => Array
                        (
                            [0] => ALTER TABLE `core_cache_tag` ADD PRIMARY KEY (`tag`,`cache_id`)
                        )

                )

            [1] => Array
                (
                    [file] => /home/mobilslf/public_html/lib/Varien/Db/Adapter/Pdo/Mysql.php
                    [line] => 971
                    [function] => raw_query
                    [class] => Varien_Db_Adapter_Pdo_Mysql
                    [type] => ->
                    [args] => Array
                        (
                            [0] => ALTER TABLE `core_cache_tag` ADD PRIMARY KEY (`tag`,`cache_id`)
                        )

                )

            [2] => Array
                (
                    [file] => /home/mobilslf/public_html/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.27-0.8.28.php
                    [line] => 34
                    [function] => addKey
                    [class] => Varien_Db_Adapter_Pdo_Mysql
                    [type] => ->
                    [args] => Array
                        (
                            [0] => core_cache_tag
                            [1] => 
                            [2] => Array
                                (
                                    [0] => tag
                                    [1] => cache_id
                                )

                            [3] => PRIMARY
                        )

                )

            [3] => Array
                (
                    [file] => /home/mobilslf/public_html/app/code/core/Mage/Core/Model/Resource/Setup.php
                    [line] => 376
                    [args] => Array
                        (
                            [0] => /home/mobilslf/public_html/app/code/core/Mage/Core/sql/core_setup/mysql4-upgrade-0.8.27-0.8.28.php
                        )

                    [function] => include
                )

            [4] => Array
                (
                    [file] => /home/mobilslf/public_html/app/code/core/Mage/Core/Model/Resource/Setup.php
                    [line] => 289
                    [function] => _modifyResourceDb
                    [class] => Mage_Core_Model_Resource_Setup
                    [type] => ->
                    [args] => Array
                        (
                            [0] => upgrade
                            [1] => 0.8.27
                            [2] => 0.8.28
                        )

                )

            [5] => Array
                (
                    [file] => /home/mobilslf/public_html/app/code/core/Mage/Core/Model/Resource/Setup.php
                    [line] => 233
                    [function] => _upgradeResourceDb
                    [class] => Mage_Core_Model_Resource_Setup
                    [type] => ->
                    [args] => Array
                        (
                            [0] => 0.8.27
                            [1] => 0.8.28
                        )

                )

            [6] => Array
                (
                    [file] => /home/mobilslf/public_html/app/code/core/Mage/Core/Model/Resource/Setup.php
                    [line] => 161
                    [function] => applyUpdates
                    [class] => Mage_Core_Model_Resource_Setup
                    [type] => ->
                    [args] => Array
                        (
                        )

                )

            [7] => Array
                (
                    [file] => /home/mobilslf/public_html/app/code/core/Mage/Core/Model/App.php
                    [line] => 399
                    [function] => applyAllUpdates
                    [class] => Mage_Core_Model_Resource_Setup
                    [type] => ::
                    [args] => Array
                        (
                        )

                )

            [8] => Array
                (
                    [file] => /home/mobilslf/public_html/app/code/core/Mage/Core/Model/App.php
                    [line] => 329
                    [function] => _initModules
                    [class] => Mage_Core_Model_App
                    [type] => ->
                    [args] => Array
                        (
                        )

                )

            [9] => Array
                (
                    [file] => /home/mobilslf/public_html/app/Mage.php
                    [line] => 627
                    [function] => run
                    [class] => Mage_Core_Model_App
                    [type] => ->
                    [args] => Array
                        (
                            [0] => Array
                                (
                                    [scope_code] => 
                                    [scope_type] => store
                                    [options] => Array
                                        (
                                        )

                                )

                        )

                )

            [10] => Array
                (
                    [file] => /home/mobilslf/public_html/index.php
                    [line] => 80
                    [function] => run
                    [class] => Mage
                    [type] => ::
                    [args] => Array
                        (
                            [0] => 
                            [1] => store
                        )

                )

        )

    [previous:Exception:private] => 
    [errorInfo] => Array
        (
            [0] => 42000
            [1] => 1068
            [2] => Multiple primary key defined
        )

)