MVC 4 - Uploadify 500 (swf does extra request)

[TD1]

In MVC 4 I got an /Book/Create page. In this page there is an EditorTemplate with the following code:\[code\]<input type="file" name="file_upload" id="file_upload" />\[/code\]Also I've made a javascript file which contains:\[code\]$(document).ready(function () { $('#file_upload').uploadify({ swf: '/Content/Flash/uploadify.swf', debug: true, auto: false });});\[/code\]Now I'm using Uploadify 3.2 with the .swf file and everything works fine.Except for the initialization of the page, first /Book/Create is called.Then after this /Book/ is called (the Index action).Firebug says the following:Answer headers\[code\]HTTP/1.1 500 Internal Server ErrorCache-Control: privateContent-Type: text/html; charset=utf-8Server: Microsoft-IIS/8.0X-AspNet-Version: 4.0.30319X-MiniProfiler-Ids: ["fa95eddf-e604-4678-adb3-9f3ea445b7e2"]X-SourceFiles: =?UTF-8?B?RDpcVHJhY2VIZXJcUHJvamVjdHNcVHJhY2VcVHJhY2UuSGVyVUlcQmFiZVw=?=X-Powered-By: ASP.NETDate: Thu, 27 Sep 2012 13:49:38 GMTContent-Length: 1342\[/code\]Request headers\[code\]GET /Book/ HTTP/1.1Host: localhost:42740User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8Accept-Language: nl,en-us;q=0.7,en;q=0.3Accept-Encoding: gzip, deflateConnection: keep-aliveReferer: http://localhost:42740/Content/Flash/uploadify.swf?preventswfcaching=1348753776045\[/code\]SWF DEBUG\[code\]---SWFUpload Instance Info---Version: 2.2.0 2009-03-25Movie Name: SWFUpload_0Settings: upload_url: /Book/uploadify.php flash_url: /Content/Flash/uploadify.swf?preventswfcaching=1348753776045 use_query_string: false requeue_on_error: false http_success: assume_success_timeout: 30 file_post_name: Filedata post_params: [object Object] file_types: *.* file_types_description: All Files file_size_limit: 0 file_upload_limit: 0 file_queue_limit: 999 debug: true prevent_swf_caching: true button_placeholder_id: file_upload button_placeholder: Not Set button_image_url: /Book/ button_width: 120 button_height: 30 button_text: button_text_style: color: #000000; font-size: 16pt; button_text_top_padding: 0 button_text_left_padding: 0 button_action: -110 button_disabled: false custom_settings: [object Object]Event Handlers: swfupload_loaded_handler assigned: false file_dialog_start_handler assigned: true file_queued_handler assigned: true file_queue_error_handler assigned: true upload_start_handler assigned: true upload_progress_handler assigned: true upload_error_handler assigned: true upload_success_handler assigned: true upload_complete_handler assigned: true debug_handler assigned: trueSWF DEBUG: SWFUpload Init CompleteSWF DEBUG: SWF DEBUG: ----- SWF DEBUG OUTPUT ----SWF DEBUG: Build Number: SWFUPLOAD 2.2.0SWF DEBUG: movieName: SWFUpload_0SWF DEBUG: Upload URL: /Book/uploadify.phpSWF DEBUG: File Types String: *.*SWF DEBUG: Parsed File Types: SWF DEBUG: HTTP Success: 0SWF DEBUG: File Types Description: All Files (*.*)SWF DEBUG: File Size Limit: 0 bytesSWF DEBUG: File Upload Limit: 0SWF DEBUG: File Queue Limit: 999SWF DEBUG: Post Params:SWF DEBUG: ----- END SWF DEBUG OUTPUT ----SWF DEBUG: \[/code\]I think it has something to do with the button_image_url in the swf debug. But even if I set the buttonImage property in the javascript it doesn't change.