Exception message: Server cannot append header after HTTP headers have been sent. in Web Front end server every time

In WFE servers event viewer I found many errors like below, I did check in, check out for all images in library but still these are coming, how do I solve this issue?

http://intranet.xxx.sa/Style Library

Exception message: Server cannot append header after HTTP headers have been sent.

Log Name:      Application
Source:        ASP.NET 2.0.50727.0
Date:          24/11/36 12:03:20 م
Event ID:      1309
Task Category: Web Event
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      XXXSPDV01.xxx.local
Description:
Event code: 3005  Event message: An unhandled exception has occurred.  Event time: 24/11/36 12:03:20 م  Event time (UTC): 24/11/36 09:03:20 ص  Event ID: d40446bd7e5b4e6c913246f492d0b93d  Event sequence: 9734  Event occurrence: 48  Event detail code: 0    Application information:      Application domain: /LM/W3SVC/838794701/ROOT-1-130861762583645739      Trust level: WSS_Minimal      Application Virtual Path: /      Application Path: C:\inetpub\wwwroot\wss\VirtualDirectories\80\      Machine name: XXXSPDV01    Process information:      Process ID: 10352      Process name: w3wp.exe      Account name: XXX\spfarm    Exception information:      Exception type: HttpException      Exception message: Server cannot append header after HTTP headers have been sent.    Request information:      Request URL: http://intranet.xxx.sa/Style Library/Images/alert.gif      Request path: /Style Library/Images/alert.gif      User host address:
   User: 0#.w|xxx\xx     Is authenticated: True      Authentication Type: Federation      Thread account name: XXX\spfarm    Thread information:      Thread ID: 5      Thread account name: XXX\spfarm      Is impersonating: False      Stack trace:    at System.Web.HttpResponse.AppendHeader(String name, String value)
   at Microsoft.SharePoint.Publishing.BlobCache.SetResponseHeaders(HttpContext context, BlobCacheEntry target)
   at Microsoft.SharePoint.Publishing.BlobCache.SendCachedFile(HttpContext context, BlobCacheEntry target, SPUserToken currentUserToken, SiteEntry currentSiteEntry)
   at Microsoft.SharePoint.Publishing.BlobCache.SendCachedFile(HttpContext context, BlobCacheEntry target, SiteEntry currentSiteEntry)
   at Microsoft.SharePoint.Publishing.BlobCache.HandleCachedFile(HttpContext context, BlobCacheEntry target, Boolean anonymousUser, SiteEntry currentSiteEntry, Boolean preAuthenticate)
   at Microsoft.SharePoint.Publishing.BlobCache.RewriteUrl(Object sender, EventArgs e, Boolean preAuthenticate)
   at Microsoft.SharePoint.Publishing.PublishingHttpModule.AuthorizeRequestHandler(Object sender, EventArgs ea)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
    Custom event details:  
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="ASP.NET 2.0.50727.0" />
    <EventID Qualifiers="32768">1309</EventID>
    <Level>3</Level>
    <Task>3</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2015-09-08T09:03:20.000000000Z" />
    <EventRecordID>60389623</EventRecordID>
    <Channel>Application</Channel>
    <Computer>XXXSPDV01.xxx.local</Computer>
    <Security />
  </System>
  <EventData>
    <Data>3005</Data>
    <Data>An unhandled exception has occurred.</Data>
       <Data>WSS_Minimal</Data>
    <Data>/</Data>
    <Data>C:\inetpub\wwwroot\wss\VirtualDirectories\80\</Data>
    <Data>XXXSPDV01</Data>
    <Data>
    </Data>
    <Data>10352</Data>
    <Data>w3wp.exe</Data>
    <Data>XXX\spfarm</Data>
    <Data>HttpException</Data>
    <Data>Server cannot append header after HTTP headers have been sent.</Data>
    <Data>http://intranet.xxx.sa/Style Library/Images/alert.gif</Data>
    <Data>/Style Library/Images/alert.gif</Data>
    <Data>10.21.198.11</Data>
    <Data>0#.w|xxx\xxx</Data>
    <Data>True</Data>
    <Data>Federation</Data>
    <Data>XXX\spfarm</Data>
    <Data>5</Data>
    <Data>XXX\spfarm</Data>
    <Data>False</Data>
    <Data>   at System.Web.HttpResponse.AppendHeader(String name, String value)
   at Microsoft.SharePoint.Publishing.BlobCache.SetResponseHeaders(HttpContext context, BlobCacheEntry target)
   at Microsoft.SharePoint.Publishing.BlobCache.SendCachedFile(HttpContext context, BlobCacheEntry target, SPUserToken currentUserToken, SiteEntry currentSiteEntry)
   at Microsoft.SharePoint.Publishing.BlobCache.SendCachedFile(HttpContext context, BlobCacheEntry target, SiteEntry currentSiteEntry)
   at Microsoft.SharePoint.Publishing.BlobCache.HandleCachedFile(HttpContext context, BlobCacheEntry target, Boolean anonymousUser, SiteEntry currentSiteEntry, Boolean preAuthenticate)
   at Microsoft.SharePoint.Publishing.BlobCache.RewriteUrl(Object sender, EventArgs e, Boolean preAuthenticate)
   at Microsoft.SharePoint.Publishing.PublishingHttpModule.AuthorizeRequestHandler(Object sender, EventArgs ea)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously)
</Data>
  </EventData>
</Event>