I am attempting to upgrade from DNN 08.00.04 to 09.01.01 (a recommended upgrade step) and the installer fails the with following error. Please help.
00:00:00.112 - Upgrading to Version: 09.01.01
00:00:00.162 - Executing Script:09.00.00.SqlDataProvider
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.IO.IOException: The process cannot access the file 'D:\Inetpub\wwwroot\DotNetNukeGlobal\installBlocker.lock' because it is being used by another process.
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.
[IOException: The process cannot access the file 'D:\Inetpub\wwwroot\DotNetNukeGlobal\installBlocker.lock' because it is being used by another process.]
System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) +893
System.IO.File.InternalDelete(String path, Boolean checkHost) +14705219
DotNetNuke.Services.Install.Install.OnLoad(EventArgs e) +517
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785
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