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Forms App Admin Event log error 10502 - UnexpectedErrorErrorAdmin

Forms Version 12
Updated December 10
asked on December 9

Getting this constantly - Forms version 12.0.2503.10378.  Any ideas?

An unexpected error has occurred. [LFF502-UnexpectedError]

Details:
URL: /Forms/Home/Tasks/{{icon || src || svgUrl}}
Error: UnexpectedError
Date: 12/9/2025 9:43:38 AM (Mountain Standard Time)
HTTP Status Code: 500
Business Process ID: 0
User: XXXXXX
IP: XXXXXXX
Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36
Business Process Name: 

Stack Trace:
Caught exception: Laserfiche.Forms.CommonUtils.Exceptions.LFFormsException
Message: An unexpected error has occurred. [LFF502-UnexpectedError]


Inner exception: System.ArgumentException
Message: Illegal characters in path.
   at System.IO.LongPathHelper.Normalize(String path, UInt32 maxPathLength, Boolean checkInvalidCharacters, Boolean expandShortPaths)
   at System.IO.Path.NormalizePath(String path, Boolean fullCheck, Int32 maxPathLength, Boolean expandShortPaths)
   at System.IO.Path.GetFullPathInternal(String path)
   at System.Security.Util.StringExpressionSet.CanonicalizePath(String path, Boolean needFullPath)
   at System.Security.Util.StringExpressionSet.CreateListFromExpressions(String[] str, Boolean needFullPath)
   at System.Security.Permissions.FileIOPermission.AddPathList(FileIOPermissionAccess access, AccessControlActions control, String[] pathListOrig, Boolean checkForDuplicates, Boolean needFullPath, Boolean copyPathList)
   at System.Security.Permissions.FileIOPermission..ctor(FileIOPermissionAccess access, String path)
   at System.Web.InternalSecurityPermissions.PathDiscovery(String path)
   at System.Web.HttpRequest.MapPath(VirtualPath virtualPath, VirtualPath baseVirtualDir, Boolean allowCrossAppMapping)
   at System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage)
   at System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm)
   at System.Web.Mvc.Html.ChildActionExtensions.ActionHelper(HtmlHelper htmlHelper, String actionName, String controllerName, RouteValueDictionary routeValues, TextWriter textWriter)
   at System.Web.Mvc.Html.ChildActionExtensions.Action(HtmlHelper htmlHelper, String actionName, String controllerName, RouteValueDictionary routeValues)
   at ASP._Page_Views_Home_Inbox_cshtml.<Execute>b__1a() in c:\Program Files\Laserfiche\Laserfiche Forms\Forms\Views\Home\Inbox.cshtml:line 122
   at System.Web.WebPages.WebPageBase.<>c__DisplayClass42_0.<RenderSection>b__0(TextWriter tw)
   at System.Web.WebPages.WebPageExecutingBase.WriteTo(TextWriter writer, HelperResult content)
   at ASP._Page_Views_Shared__Layout_app_cshtml.<RenderSectionTopHeader>b__5(TextWriter __razor_helper_writer) in c:\Program Files\Laserfiche\Laserfiche Forms\Forms\Views\Shared\_Layout.app.cshtml:line 106
   at System.Web.WebPages.WebPageBase.Write(HelperResult result)
   at ASP._Page_Views_Shared__Layout_app_cshtml.<Execute>b__39() in c:\Program Files\Laserfiche\Laserfiche Forms\Forms\Views\Shared\_Layout.app.cshtml:line 187
   at System.Web.WebPages.WebPageBase.<>c__DisplayClass42_0.<RenderSection>b__0(TextWriter tw)
   at System.Web.WebPages.WebPageBase.Write(HelperResult result)
   at ASP._Page_Views_Shared__Layout_cshtml.Execute() in c:\Program Files\Laserfiche\Laserfiche Forms\Forms\Views\Shared\_Layout.cshtml:line 127
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()
   at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()
   at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)
   at System.Web.WebPages.WebPageBase.<>c__DisplayClass40_0.<RenderPageCore>b__0(TextWriter writer)
   at System.Web.WebPages.WebPageBase.Write(HelperResult result)
   at System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body)
   at System.Web.WebPages.WebPageBase.PopContext()
   at System.Web.WebPages.WebPageBase.<>c__DisplayClass40_0.<RenderPageCore>b__0(TextWriter writer)
   at System.Web.WebPages.WebPageBase.Write(HelperResult result)
   at System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body)
   at System.Web.WebPages.WebPageBase.PopContext()
   at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
   at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass3_1.<BeginInvokeAction>b__1(IAsyncResult asyncResult)

 

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Answer

SELECTED ANSWER
replied on December 9

This is resolved in the Forms 12 Fall 2025 release.

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Replies

replied on December 10

We used to see that occasionally. We found that users would share links from their address bar that contained irrelevant query parameters for login. The logins were successful, but that error was thrown in the event logs. We learned to just ignore this error.

1 0
replied on December 9

I have a couple instances of Forms 11 with this, too. I had a support case about it 6 months ago and it had something to do with Edge. 

From the ticket:

"When a user uses Microsoft Edge(HTML) to access Forms pages, Microsoft Edge(HTML) will append "/{{icon || src || svgUrl}}" to the links on the pages automatically and will cause the error logged in event log, but the end user will not be affected as this error will not be show to them.

In Laserfiche 11, the support of Microsoft Edge(HTML) will be ended(https://answers.laserfiche.com/questions/179345/EndofSupport-Announcement-for-Internet-Explorer-and-Microsoft-Edge-Legacy) so we will not fix this issue, but it is harmless in nature."

The customer in question here was using Edge on desktops.

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