I use joomla 2.5.6 and template it_theshop use System - Ice Speed ​​and Mobile Joomla!v1.1.1
But the following error when accessing iphone.domain.com
But the following error when accessing m.domain.com
When such errors, then just reload the page, the error will go away.
Expect the guidance to fix the error on
Sorry for my bad english . thank you

I'm not sure how IceSpeed works, but most likely this bug arise if page doesn't contain tags to load css or js (<link> and <script> correspondingly).

As to warning message, you can set "Error Reporting: None" in Joomla's global configuration ("Server" tab). After that all errors will be added to error_log only (without duplicating on the screen).

I am correct but it still such
and me fix m in the file \ plugins \ system \ ice_speed \ ice_speed \engine_base.php
I am not wish to Command following running
144: /**
145: function cleanUpTags( $tags, $body ) {
146: foreach( $tags as $tag ) {
147: $body = str_replace( $tag, '', $body);
148: }
149: return $body;
150: }
151: */
and
* /
208: if( $isCache ){ // echo '<Pre>'.print_r($output[$type.'Tags'],1); die;
209: //$body = $this->cleanUpTags( $output[$type.'Tags'], $body );
And it is no longer bug again. but do not know if it has affect nothing cho web non

Most likely line #146 should be replaced with

if( is_array($tags) )  foreach( $tags as $tag ) {

I had to fix on your own and the website has to run very well.
Thank You very much

Try