(string) ERROR: Cannot save mysql structure ($refresh:,$table:)

 (array) Array
(
    [0] => Array
        (
            [file] => /DISK2/www/webovky.cz/core/modules/db.class.php
            [line] => 426
            [function] => loadDbStructure
            [class] => dbDriverMySQL
            [type] => ->
            [args] => Array
                (
                )

        )

    [1] => Array
        (
            [file] => /DISK2/www/webovky.cz/core/modules/db.class.php
            [line] => 741
            [function] => getDataByColumns
            [class] => dbDriverMySQL
            [type] => ->
            [args] => Array
                (
                    [0] => log
                    [1] => Array
                        (
                            [logCode] => connect@db
                            [logStatus] => 1
                            [logText] => Cannot connect to DB
                            [logData] => 
                            [logTrac] => 
                        )

                )

        )

    [2] => Array
        (
            [file] => /DISK2/www/webovky.cz/core/modules/db.class.php
            [line] => 156
            [function] => insert
            [class] => dbFactory
            [type] => ->
            [args] => Array
                (
                    [0] => Array
                        (
                            [0] => log
                            [1] => Array
                                (
                                    [logCode] => connect@db
                                    [logStatus] => 1
                                    [logText] => Cannot connect to DB
                                    [logData] => 
                                    [logTrac] => 
                                )

                        )

                )

        )

    [3] => Array
        (
            [file] => /DISK2/www/webovky.cz/core/modules/core.class.php
            [line] => 692
            [function] => insert
            [class] => db
            [type] => ::
            [args] => Array
                (
                    [0] => log
                    [1] => Array
                        (
                            [logCode] => connect@db
                            [logStatus] => 1
                            [logText] => Cannot connect to DB
                            [logData] => 
                            [logTrac] => 
                        )

                )

        )

    [4] => Array
        (
            [file] => /DISK2/www/webovky.cz/core/modules/core.class.php
            [line] => 730
            [function] => add2log
            [class] => Core
            [type] => ::
            [args] => Array
                (
                    [0] => connect@db
                    [1] => Cannot connect to DB
                    [2] => 1
                    [3] => 
                )

        )

    [5] => Array
        (
            [file] => /DISK2/www/webovky.cz/core/modules/core.class.php
            [line] => 71
            [function] => reportError
            [class] => Core
            [type] => ::
            [args] => Array
                (
                    [0] => connect@db
                    [1] => Cannot connect to DB
                )

        )

    [6] => Array
        (
            [file] => /DISK2/www/webovky.cz/core/core.php
            [line] => 24
            [function] => init
            [class] => Core
            [type] => ::
            [args] => Array
                (
                )

        )

    [7] => Array
        (
            [file] => /DISK2/www/webovky.cz/index.php
            [line] => 50
            [args] => Array
                (
                    [0] => /DISK2/www/webovky.cz/core/core.php
                )

            [function] => include
        )

)