The uploaded file exceeds the upload_max_filesize directive in php.ini.

In most cases if you are on a shared host, you will not see a php.ini file in your directory. If you do not see one, then create a file called php.ini and upload it in the root folder. In that file add the following code:

php -i | grep 'php.ini'

upload_max_filesize = 64M
post_max_size = 64M
max_execution_time = 300