Make sure that "cache/*" is writable and then try again
Exception Object
(
    [message:protected] => Directory cache/cacheconfig/ not writable!
    [string:Exception:private] => 
    [code:protected] => 0
    [file:protected] => /var/www/clients/client1/web2/web/LHC/lib/core/lhtpl/tpl.php
    [line:protected] => 15
    [trace:Exception:private] => Array
        (
            [0] => Array
                (
                    [file] => /var/www/clients/client1/web2/web/LHC/lib/core/lhtpl/tpl.php
                    [line] => 104
                    [function] => __construct
                    [class] => erLhcoreClassCacheStorage
                    [type] => ->
                    [args] => Array
                        (
                            [0] => cache/cacheconfig/
                        )

                )

            [1] => Array
                (
                    [file] => /var/www/clients/client1/web2/web/LHC/modules/lhinstall/install.php
                    [line] => 26
                    [function] => __construct
                    [class] => erLhcoreClassTemplate
                    [type] => ->
                    [args] => Array
                        (
                            [0] => lhinstall/install1.tpl.php
                        )

                )

            [2] => Array
                (
                    [file] => /var/www/clients/client1/web2/web/LHC/lib/core/lhcore/lhmodule.php
                    [line] => 96
                    [args] => Array
                        (
                            [0] => /var/www/clients/client1/web2/web/LHC/modules/lhinstall/install.php
                        )

                    [function] => include
                )

            [3] => Array
                (
                    [file] => /var/www/clients/client1/web2/web/LHC/lib/core/lhcore/lhmodule.php
                    [line] => 542
                    [function] => runModule
                    [class] => erLhcoreClassModule
                    [type] => ::
                    [args] => Array
                        (
                        )

                )

            [4] => Array
                (
                    [file] => /var/www/clients/client1/web2/web/LHC/index.php
                    [line] => 44
                    [function] => moduleInit
                    [class] => erLhcoreClassModule
                    [type] => ::
                    [args] => Array
                        (
                        )

                )

        )

    [previous:Exception:private] => 
)