未定义的偏移量1-Undefinedoffset:1错误该怎样解决

错误事件：E_NOTICE Run-time 通知。脚本发现可能有错误发生，但也可能在脚本正常运行时发生。
C:\WWW\weixin\member\shop\skin\23.php错误行数：第8行
错误原因：Undefined offset: 1

源代码：
$Dwidth = array('640','640','203','203','203','609','640','608','640','608');
$DHeight = array('320','63','121','121','121','93','63','187','63','187');
$Home_Json=json_decode($rsSkin['Home_Json'],true);
for($no=1;$no<=10;$no++){
$json[$no-1]=array(
"ContentsType"=>$no==1?"1":"0",
"Title"=>$no==1?json_encode($Home_Json[$no-1]['Title']):$Home_Json[$no-1]['Title'],
"ImgPath"=>$no==1?json_encode($Home_Json[$no-1]['ImgPath']):$Home_Json[$no-1]['ImgPath'],
"Url"=>$no==1?json_encode($Home_Json[$no-1]['Url']):$Home_Json[$no-1]['Url'],
"Postion"=>$no>9 ? "t".$no : "t0".$no,
"Width"=>$Dwidth[$no-1],
"Height"=>$DHeight[$no-1],
"NeedLink"=>"1"
);
}

出现这个问题不知道咋解决。。。。求助各位