Greetings to the DNN community.

I've been attempting to upgrade my DNN 3.2.1 installation to DNN 3.3.4.

I think I've followed all steps explained in the DNN documentation including the backup of my DNN 3.2.1 web config file. I used the information in this file in the new DNN 3.3.4 Web.config file.

After starting the upgrade procedure I get the following error:

Server Error in '/dnn' Application.
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The ConnectionString property has not been initialized.
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.InvalidOperationException: The ConnectionString property has not been initialized.

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:

[InvalidOperationException: The ConnectionString property has not been initialized.]
   System.Data.SqlClient.SqlConnection.Open() +433
   DotNetNuke.Data.SqlDataProvider.ExecuteADOScript(String SQL) +74
   DotNetNuke.Data.SqlDataProvider.ExecuteScript(String Script, Boolean UseTransactions) +738
   DotNetNuke.Data.SqlDataProvider.ExecuteScript(String Script) +6
   DotNetNuke.Data.SqlDataProvider.GetProviderPath() +201
   DotNetNuke.Common.Globals.GetUpgradeStatus() +66
   DotNetNuke.Common.Global.CheckVersion() +101
   DotNetNuke.Common.Global.Application_Start(Object Sender, EventArgs E) +314
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Version Information: Microsoft .NET Framework Version:1.1.4322.2300; ASP.NET Version:1.1.4322.2300

Any input will be greatly appreciated.

Cheers!