Details

Category: Troubleshooting

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This can be due two main reasons:

1. The [Joomla]/tmp/ folder is unwritable; (most likely)
2. The file size is bigger than your php memory usage limit;

Possible solutions:

Change the permitions of the [Joomla]/tmp/ folder:

1. You can use an FTP client, a web file manager or change it via SSH;

Change the memory_limit:

1. Locate the php.ini file used by your web server. You can use the phpinfo() PHP function to find it. You can find this info at  Help -> System Info from the drop-down menu on the Back-end of your Joomla! installation, under the PHP Innformation tab;
2. Edit the memory_limit parameter in the php.ini file (usually in a section called Resource Limits). Example:
   memory_limit = 32M  ; #Maximum amount of memory a script may consume (32MB)
   If there is no section already for this, place the above line at the end of the file;
3. Restart Apache.