Warnings received when uploading new .zip themes

Below is the erros I just received when uploading a new theme in .zip format. I often receive these same errors and were wondering if it is something I am not doing correct. I am new to this so any advice would be appreciated.

Unpacking the package…

Installing the theme…

Theme installed successfully.

Warning: fopen(/home/betepper/public_html/wordpress/wp-content/themes/portfolious1/style.css) [function.fopen]: failed to open stream: No such file or directory in /home/betepper/public_html/wordpress/wp-includes/functions.php on line 4284

Warning: fread(): supplied argument is not a valid stream resource in /home/betepper/public_html/wordpress/wp-includes/functions.php on line 4287

Warning: fclose(): supplied argument is not a valid stream resource in /home/betepper/public_html/wordpress/wp-includes/functions.php on line 4290