I have searched all over the net for the solution but none seems to be working.
Whenever I try to upload a plugin, I use .zip files but it doesn't upload and instead, I get this two error:
Warning: copy(/home/domain/public_html/wp-content/uploads/2011/12/linkwithin.zip) [function.copy]: failed to open stream: Permission denied in /home/domain/public_html/wp-admin/includes/file.php on line 348
Installing Plugin from uploaded file: linkwithin.zip
Downloading install package from /home/domain/public_html/wp-content/uploads/2011/12/linkwithin.zip…
Download failed. A valid URL was not provided.
Return to Plugins page
What would the solution be? Please help me!