Output to host file system not working

Hi,

I have JasperServer 5.5 Express Edition and I configured the option "output to host file system" using this link:

http://community.jaspersoft.com/documentation/jasperreports-server-admin...

I restarted the server which has the jaspersoft application and I checked that the property enableSaveToHostFS is now 'true' but the result is the same that it was. I have the "output to host file system" button disabled. Whats is wrong?

Thanks in advance,

Clara.