suddenly today I am unable to upload files to my clients site I get the following message…

Upload Errorclose
Unable to copy file to storage directory. Please check permissions on your upload directory and ensure they can be written to by your web server.

before this happend the image I tried to upload looked like it loaded but with out a preview. tried to rescan it and goth the following meesage…

Upload Errorclose
Unable to copy file to storage directory. Please check permissions on your upload directory and ensure they can be written to by your web server.



Rescanclose

Warning: imagepng() [function.imagepng]: Unable to open '/home/chesterh/public_html/files/thumbnails/7313/3546/0049/glyphicons-halflings.jpg' for writing: No such file or directory in /home/chesterh/public_html/concrete/helpers/image.php on line 176

Warning: imagepng() [function.imagepng]: Unable to open '/home/chesterh/public_html/files/thumbnails/level2/7313/3546/0049/glyphicons-halflings.jpg' for writing: No such file or directory in /home/chesterh/public_html/concrete/helpers/image.php on line 176
File glyphicons-halflings.png has been rescanned

Tried to clear cache and the whole site crashed and got the following message…

error
[26/04/2012 18:12:41] Jonathan Rimmer: Fatal error: Call to a member function getBlockTypeHandle() on a non-object in /home/chesterh/public_html/concrete/libraries/block_view_template.php on line 41

hope someone has some answer to this issue (had to get my ISP to restore site twice today not good)