Internationalization addon SAFE MODE ON!

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I get this error after installing the Internationalization addon.

my host says that i need to change the "cache directory" to /var/www/tmp ...but i have no clue on were to do this?

Warning: realpath() [function.realpath]: SAFE MODE Restriction in effect. The script whose uid is 1788 is not allowed to access /var/www/tmp owned by uid 505 in /var/www/mydomaine.dk/public_html/subfolder/updates/concrete5.5.1/concrete/libraries/3rdparty/Zend/Cache/Backend.php on line 161
Warning: realpath() [function.realpath]: SAFE MODE Restriction in effect. The script whose uid is 1788 is not allowed to access /var/www/tmp owned by uid 505 in /var/www/mydomaine.dk/public_html/subdomain/updates/concrete5.5.1/concrete/libraries/3rdparty/Zend/Cache/Backend.php on line 171
Warning: is_readable() [function.is-readable]: open_basedir restriction in effect. File(/tmp) is not within the allowed path(s): (/var/www/mydomaine.dk/:/var/www/tmp/) in /var/www/mydomaine.dk/public_html/subdomain/updates/concrete5.5.1/concrete/libraries/3rdparty/Zend/Cache/Backend.php on line 208
Warning: tempnam() [function.tempnam]: open_basedir restriction in effect. File(/tmp) is not within the allowed path(s): (/var/www/mydomaine.dk/:/var/www/tmp/) in /var/www/mydomaine.dk/public_html/scierra/updates/concrete5.5.1/concrete/libraries/3rdparty/Zend/Cache/Backend.php on line 183
Warning: is_readable() [function.is-readable]: open_basedir restriction in effect. File(/tmp) is not within the allowed path(s): (/var/www/mydomaine.dk/:/var/www/tmp/) in /var/www/mydomaine.dk/public_html/subdomain/updates/concrete5.5.1/concrete/libraries/3rdparty/Zend/Cache/Backend.php on line 208
Concrete CMS
An unexpected error occurred.
Could not determine temp directory, please specify a cache_dir manually



/Mike

mikefatty