Versions of application and configuration are incompatible

I can't get past this error message when trying to upgrade.  I made sure everything on this post here about a similar error was correct:  https://community.bpmonline.com/questions/bpmonline-upgrade-7113-7120/

Has anyone had this problem and gotten it to work?  I emailed support, and they told me I had to redo the upgrade.  This is the 4th time, and this message still comes up.

Thanks

Server Error in '/0' Application.

Versions of application "7.12.0.2702" and configuration "7.12.1" are incompatible

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: Terrasoft.Common.AppStartupException: Versions of application "7.12.0.2702" and configuration "7.12.1" are incompatible



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:

 

[AppStartupException: Versions of application "7.12.0.2702" and configuration "7.12.1" are incompatible]
   Terrasoft.Core.AppConnection.CheckConfigurationVersion() +191
   Terrasoft.Core.AppConnection.Initialize(ConfigurationSectionGroup appConfigurationSectionGroup) +576
   Terrasoft.WebApp.Global.InitializeAppConnection() +473
   Terrasoft.WebApp.Global.Application_Start(Object sender, EventArgs e) +332
 
[HttpException (0x80004005): Versions of application "7.12.0.2702" and configuration "7.12.1" are incompatible]
   System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +520
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +176
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +165
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +353
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +341
 
[HttpException (0x80004005): Versions of application "7.12.0.2702" and configuration "7.12.1" are incompatible]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +523
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +107
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +688