w3c validation error

Hello, when I try to validate my page www.casaprivee.com in validator.w3.org/ it's impossilbe because I have the followin error "Sorry! This document can not be checked." "on line 266 it contained one or more bytes that I cannot interpret as utf-8".

On line 266 I have a code from cblogin module:
<input type="submit" name="Submit" class="button" value="Iniciar Sesi&oacute;n" style="min-height:20px;padding-

I've tried to validate disabling cblogin module and the problem dissapears.
I've seen that exists a topic in the forum with a similar problem but I don't know how to fix it.
Could you help me?
Thanks in advance!

excuse me, I haven't paste de total code of line 266, the full code it's the following:
<input type="submit" name="Submit" class="button" value="Iniciar Sesi&oacute;n" style="min-height:20px;padding-left:30px;cursor:pointer;background-image:url( www.casaprivee.com/modules/mod_cblogin/mod_cblogin/login.png );background-position:0 0;background-repeat:no-repeat;width:auto;" />
Thanks,