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Script error when upgrading

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We are having severe problems in upgrading CMS to version 7

1. Entering EpiServer Deployment Center
2. All action tab -> Upgrade site with SQL Server database
3. Error occurs, as in detailed screen output below and the installation process is stalled.

Screen output (text put in bold below is coming out red on screen):

Add-PSSnapin : Cannot load Windows PowerShell snap-in EPiServer.Install.CMS.7.0

.586.1 because of the following error: Could not load file or assembly 'file://

/C:\Program Files (x86)\EPiServer\CMS\7.0.586.1\Install\Tools\EPiServerInstall.

CMS.dll' or one of its dependencies. This assembly is built by a runtime newer

than the currently loaded runtime and cannot be loaded.

At C:\Program Files (x86)\EPiServer\CMS\7.0.586.1\Upgrade\System Scripts\Upgrad

e Site (SqlServer).ps1:41 char:14

+     Add-PSSnapin <<<<  EPiServer.Install.CMS.$epiVersion

    + CategoryInfo          : InvalidArgument: (EPiServer.Install.CMS.7.0.586.1

:String) [Add-PSSnapin], PSSnapInException

    + FullyQualifiedErrorId : AddPSSnapInRead,Microsoft.PowerShell.Commands.AddPSSnapinCommand

 

An unhandled error has occured:

The term 'New-EPiCMSWizard' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included,

verify that the path is correct and try again.

When executing

 At C:\Program Files (x86)\EPiServer\CMS\7.0.586.1\Upgrade\System Scripts\Upgrade Site (SqlServer).ps1:43 char:27

+ $wizard = New-EPiCMSWizard <<<<  "UpgradeSiteWizard" 

=Get-EPiIsBulkInstalling

 

At C:\Program Files (x86)\EPiServer\CMS\7.0.586.1\Upgrade\System Scripts\Upgrade Site (SqlServer).ps1:43 char:27

+ $wizard = New-EPiCMSWizard <<<<  "UpgradeSiteWizard"

System.Management.Automation.ParentContainsErrorRecordException: The term 'New-EPiCMSWizard' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

Any help is appreciated

Thanks

Christian


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