Error-系统IO操作失败

...query[ContentId]=@id;
@queryT=@query.map(*,['ContentId={*ContentId}'],['Grade desc,ContentId asc']);
@prev=["
<li>
<span class="uas">上一篇 </span>
<a href="knowlege2_id_{@cid}_cid_{@id}.html">{@queryT[Title]}</a>
</li>

"];
}
$else{
@prev=$empty;
@title=$empty;
}

@querytwo[CatalogId]=$http.get(id);
@querytwo[ContentId]=$http.get(cid);

@newsid2=@querytwo.map(*,['status>0 and CatalogID={*CatalogId} and ContentId>{*ContentId}'],['ContentId asc']);
$if(@newsid2<>$null){
$write.out(@newsid2[ContentId]);
@id=@newsid2[ContentId];
@cid=@newsid2[CatalogId];
@querytwo[ContentId]=@id;
@queryT=@querytwo.map(*,['ContentId={*ContentId}'],['Grade desc,ContentId asc']);

@next=["
<li>
<span class="uas">下一篇 </span>
<a href="knowlege2_id_{@cid}_cid_{@id}.html">{@queryT[Title]}</a>
</li>
"];
}
$else{
@next=$empty;
@title2=$empty;
}

$return($empty);
}