Symptoms
This error is thrown while attempting to upload a file through the admin site.
Cause
The file size exceeds the ASP.NET maximum request length restriction. By default this value is 4 megabytes.
Solution
If you need to upload files larger than 4 MB, you can modify the web.config file manually to change the maximum request length. Inside the system.web section (such as immediately before the last closing tag </system.web> ), add the following element (where 16384 is the maximum request length in kilobytes):
<httpRuntime maxRequestLength="16384" />
EXAMPLE:
