From b2evolution manual

Warning: main(/home/mandalar/public_html/blog/skins//_main.php) [function.main]: failed to open stream: No such file or directory in /home/mandalar/public_html/blog/inc/_blog_main.inc.php on line 489

Warning: main(/home/mandalar/public_html/blog/skins//_main.php) [function.main]: failed to open stream: No such file or directory in /home/mandalar/public_html/blog/inc/_blog_main.inc.php on line 489

Fatal error: main() [function.require]: Failed opening required '/home/mandalar/public_html/blog/skins//_main.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/mandalar/public_html/blog/inc/_blog_main.inc.php on line 489

This is the result when I did follow the instruction of skin installation.

[edit] Since my skin doesn't work, my blog doesn't work. HELP.

I downloaded a skin. Unzip it. Upload it. Chose it. And...

this is the error message:

The default skin [niftyyellow] set for blog [KKF Blogger] does not exist. It must be properly set in the blog properties or properly overriden in a stub file. Contact the webmaster...

Now I can't even login to my blog to change the skin.

[edit] Getting help

Your best bet for finding a solution to this problem is to click the Support tab up above and go to the b2evo forums. --Nate 08:18, 17 February 2007 (CST)

[edit] greyed out "Check to allow uploading and renaming of this file type"

My php files are locked as a security measure.

How do I unlock them when they are greyed out and the form will not let me check to unlock them so I can upload a new skin?

This is the error I get:

Some file uploads failed. Please check the errors below. «php» is a locked extension.