unformatted style - drupal commons installed and no theme was visible: problem and solution

hello dear developer hello dear users - good day all and everybody !

I prefer to tell that I'm just beginning. So thank you for your patience and your help !

first of all  i have a drupal commons installed - and i do not have any style
http://campus-24.com/ see the of the current status description here: http://stackoverflow.com/questions/8844579/drupal-commons-site-has-no-st...

see the full description of  this issue here   http://commons.acquia.com/discussion/no-theme-new-install
See the very same issue described like so: The suggestion is to convert some files to UTF-8, but which specific files should I need to change to UTF-8?
 

update:   happily fixed with  a rough hack after having read good and helpul advices here and on other forums:and after toggling the CSS-aggregation, and switched it off.

Just have a closer look at this,

> Your lack of styles on the site is due to inadequate file permissions on your server. Your site is unable to save the auto-generated compressed CSS file, thus there is no style information to be displayed. Installing a different theme would do nothing to fix this situation. If you cannot manage to get the proper files permissions set up, you may try disabling CSS aggregation by navigating to Administration -> Site Configuration -> Performance, and **toggling off the CSS aggregation** setting, then clicking the save button. This will have a negative impact on the site's performance (speed of loading pages, etc.) and I would strongly recommend that you fix the underlying issue (file permissions) permanently before launching a live site so that you can re-enable CSS aggregation!

See the very first result of configuring accordingly here http://www.campus-24.com
see the full description of  this issue here   http://commons.acquia.com/discussion/no-theme-new-install

See the very same issue described like so: The suggestion is to convert some files to UTF-8, but which specific files should I need to change to UTF-8?