DDNS HTTP/1.1 200 OK 11=Error:No space left on device

I am using :
Tomato Firmware v1.28.7492 MIPSR2-Toastman-RT K26 USB VPN-NOCAT

Everything had been working well for some period of time. Today, I suddenly cannot locate my router due to the DDNS problem.

My DDNS settings :
Service : Customer URL
URL : https://www.dnsexit.com/RemoteUpdate.sv?login=xxxx&password=xxx&host=xxx.linkpc.net&myip=
Last IP Address : 8/12/2013 12:22:20 PM:...

DDNS HTTP/1.1 200 OK 11=Error:No space left on device