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Error: Smarty error: unable to write to $cache_dir '/home/xxxxxx/htdocs/php/xoops_data/caches/smarty_cache'. Be sure $cache_dir is writable by the web server user.

Does anyone know why it said "unable to write to $cache_dir" ?
The files is writable in the web server.

umm XOOPS 2.3.3

Error: Smarty error: unable to write to $cache_dir

This page cannot be displayed due to an internal error.

You can provide the following information to the administrators of this site to help them solve the problem:

Error: Smarty error: unable to write to $cache_dir '/var/www/virtual/xoops.com./htdocs/xoops233/xoops_data/caches/smarty_cache'. Be sure $cache_dir is writable by the web server user.
Backtrace:
/class/smarty/Smarty.class.php (1092)
/class/smarty/internals/core.write_cache_file.php (81)
/class/smarty/Smarty.class.php (1278)
/class/theme.php (366)
/footer.php (75)
/index.php (79)

DEBUG
Error: Smarty error: unable to write to $cache_dir '/xoops_data/caches/smarty_cache'. Be sure $cache_dir is writable by the web server user. in file /class/smarty/Smarty.class.php line 1092

Check that the path exists and that the xoops_data and its subfolders are all set to have write permissions (chmod 777) (see release notes).

NB: Installing xoops_data and xoops_lib inside the web root is unsecure.

ghia , thanks I look , xoops_data and its subfolders are all set to have write permissions (chmod 777)

Now, works very well