Error at runtime is:

Could not load file or assembly 'log4net, Version=1.2.11.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

Assembly Load Trace:

=== Pre-bind state information ===
LOG: DisplayName = log4net, Version=1.2.11.0, Culture=neutral, PublicKeyToken=null
 (Fully-specified)
LOG: Appbase = file:///D:/TFS/MySite-Dev/Source/UmbracoBoilerPlate/
LOG: Initial PrivatePath = D:\TFS\MySite-Dev\Source\UmbracoBoilerPlate\bin
Calling assembly : Umbraco.Web.UI, Version=1.0.6185.24092, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: D:\TFS\MySite-Dev\Source\UmbracoBoilerPlate\web.config
LOG: Using host configuration file: \\csu-w-file\home\csu\paul\My Documents\IISExpress\config\aspnet.config
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework64\v4.0.30319\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///C:/Users/paul/AppData/Local/Temp/Temporary ASP.NET Files/root/5df42c6a/e58a8ef/log4net.DLL.
LOG: Attempting download of new URL file:///C:/Users/paul/AppData/Local/Temp/Temporary ASP.NET Files/root/5df42c6a/e58a8ef/log4net/log4net.DLL.
LOG: Attempting download of new URL file:///D:/TFS/MySite-Dev/Source/UmbracoBoilerPlate/bin/log4net.DLL.
WRN: Comparing the assembly name resulted in the mismatch: PUBLIC KEY TOKEN
ERR: Failed to complete setup of assembly (hr = 0x80131040). Probing terminated.

Stack trace:

    [FileLoadException: Could not load file or assembly 'log4net, Version=1.2.11.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)]
   Umbraco.Core.Logging.Logger..ctor() +0
   Umbraco.Core.Logging.Logger.CreateWithDefaultLog4NetConfiguration() +58
   Umbraco.Core.CoreBootManager.InitializeLoggerResolver() +114
   Umbraco.Core.CoreBootManager.Initialize() +180
   Umbraco.Web.WebBootManager.Initialize() +133
   Umbraco.Core.UmbracoApplicationBase.StartApplication(Object sender, EventArgs e) +405
   Umbraco.Core.UmbracoApplicationBase.Application_Start(Object sender, EventArgs e) +77

[HttpException (0x80004005): Could not load file or assembly 'log4net, Version=1.2.11.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)]
   System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +529
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +169
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +169
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +396
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +333

[HttpException (0x80004005): Could not load file or assembly 'log4net, Version=1.2.11.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +525
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +124
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +700

Hi Paul,

the package was compiled against net 4.5.2 Nuget doesn't allow installation into a different/lower net version.

Have you tried to install the normal umbraco package?

Regards David

Hi David,

I've updated my solution to be targeting .Net 4.6. I uninstalled the package then re-installed it. The package now installs via Nuget without issue, however I'm still getting:

Could not load file or assembly 'log4net, Version=1.2.11.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference.

Along with the same stack trace as above.

The thing I don't understand is why it's looking for log4net 1.2.11.0 when the package installs log4net 2.0.3 (aka 1.2.13.0). Even if I try to manually install log4net 1.2.11.0 (aka log4net 2.0.0) when building my site the package is automatically uninstalled and then replaced with log4net 2.0.3 ?

Any help you can give is appreciated.

Hi Paul,

will try to reproduce and find a fix this week. Can't they what happens here with the log4net stuff. Seems really strange.

Regards David

Ok I found the reason for the log4net error.

Details here: https://our.umbraco.org/forum/developers/extending-umbraco/45996-log4net-public-token-issues-could-not-load-file-or-assembly In summary, Event Calendar needs to be added via the back office, rather than Nuget unless you want some fun and games with log4net.

Having got everything installed and the site loading the Event Calendar in the back office loads without the left hand panel.

The trees.config has this in; is it correct?<add initialize="true" sortOrder="0" alias="ecTree" application="eventCalendar" title="Calendar" iconClosed="icon-folder" iconOpen="icon-folder-open" type="EventCalendarBelle.Trees.ECCalendarTreeController, EventCalendarBelle" /> ?

Ok, all sorted now. The above code in the trees.config wasn't overwritten when the package installed. I thought I'd removed everything, but not so, spotting the above referred to EventCalendarBelle suggested it wasn't right. Removing that line from the trees.config then reinstalling has got it working.

Trees.config should have this:

<add initialize="true" sortOrder="0" alias="ecTree" application="eventCalendar" title="Calendar" iconClosed="icon-folder" iconOpen="icon-folder-open" type="EventCalendar.Umbraco.Trees.EventCalendarTreeController, EventCalendar.Umbraco" />

Phew !

Hi Paul,

glad you figured it out and sorry for letting you jump through hoops. Nevertheless I will have a look at the log4net issue.

Regards David

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