Warning: mkdir() [function.mkdir]: Permission denied in DrupalLocalStreamWrapper->mkdir()

Drupal is giving the following error while uploading the themes:

Warning: mkdir() [function.mkdir]: Permission denied in DrupalLocalStreamWrapper->mkdir() (line 639 of /home/username/public_html/includes/stream_wrappers.inc). 
•bootstrap-7.x-2.1 (1).zip does not contain any .info files. 

Try With the Following Solution :

• Change the file permission for the /sites/default/ to 777
• Create the folder called /temps/ in the /home/username/public_html provide the file permission for the /temps/ as 777
• Login to the drupal admin panel >>Go to Configuration >> Media >> File System. Change the Temporary directory path to the following :
  home/username/public_html/temps
• Then save the settings.