Great article on stackoverflow, but none of the options seemed to help.
I did manage to get a proper stack trace however and I get this.
Access to the path ‘LogBufferMutex’ is denied.Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.UnauthorizedAccessException: Access to the path ‘LogBufferMutex’ is denied.
ASP.NET is not authorized to access the requested resource. Consider granting access rights to the resource to the ASP.NET request identity. ASP.NET has a base process identity (typically {MACHINE}\ASPNET on IIS 5 or Network Service on IIS 6 and IIS 7, and the configured application pool identity on IIS 7.5) that is used if the application is not impersonating. If the application is impersonating via <identity impersonate="true"/>, the identity will be the anonymous user (typically IUSR_MACHINENAME) or the authenticated request user.
To grant ASP.NET access to a file, right-click the file in File Explorer, choose “Properties” and select the Security tab. Click “Add” to add the appropriate user or group. Highlight the ASP.NET account, and check the boxes for the desired access.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[UnauthorizedAccessException: Access to the path ‘LogBufferMutex’ is denied.]
System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) +217
System.Threading.MutexTryCodeHelper.MutexTryCode(Object userData) +11007905
System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData) +0
System.Threading.Mutex.CreateMutexWithGuaranteedCleanup(Boolean initiallyOwned, String name, Boolean& createdNew, SECURITY_ATTRIBUTES secAttrs) +238
System.Threading.Mutex…ctor(Boolean initiallyOwned, String name, Boolean& createdNew, MutexSecurity mutexSecurity) +202
System.Threading.Mutex…ctor(Boolean initiallyOwned, String name) +49
BackendlessAPI.Logging.LogBuffer…ctor() +69
BackendlessAPI.Logging.LoggingService…ctor() +62
BackendlessAPI.Backendless.InitApp(String applicationId, String apiKey) +559
Signup.Page_Load(Object sender, EventArgs e) +31
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
System.Web.UI.Control.OnLoad(EventArgs e) +92
System.Web.UI.Control.LoadRecursive() +54
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772