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Compiler Error Message: CS0433: The type DevExpress.Web.ASPxTreeList.TreeListColumnEditFormSettings exists in both ...

Posted by Robert Joseph on 12 February 2019 05:52 PM

$Compilation ErrorDescription: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.Compiler Error Message: CS0433: The type 'DevExpress.Web.ASPxTreeList.TreeListColumnEditFormSettings' exists inboth'c:\Windows\Microsoft.NET\assembly\GAC_MSIL\DevExpress.Web.ASPxTreeList.v16.1\v4.0_16.1.6.0__b88d1754d700e49a\DevExpress.Web.ASPxTreeList.v16.1.dll' and' c:\Windows\assembly\GAC_MSIL\DevExpress.Web.ASPxTreeList.v10.2\10.2.11.0__b88d1754d700e49a\DevExpress.Web.ASPxTreeList.v10.2.dll'$

Background

Some Server Upgrades from version 9 to version 10 require manually removing old DevExpress assemblies. When manually uninstalling EIOBoard, the old versions of these assemblies remain. You will receive a similar error after login telling you the website cannot decide which to use.

Resolution

The best resolution is to delete the website from IIS then reinstall it with the EIOBoard Installer in Advanced Mode.

https://support.savance.com/index.php?/eioboard/Knowledgebase/Article/View/664/0/run-v10-on-premise-installer-in-advanced-mode

When the serve is hosting multiple sites another solution is to uninstall the following DevExpress DLLs. You will need the GAC Utility installed on your server to complete the following commands.

You will find the GAC Utility in the Microsoft SDK download available here:
https://www.microsoft.com/en-us/download/details.aspx?id=8279

The default installation path is "C:\Program Files (x86)\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\x64".

From the command prompt, navigate to the GACUtil.exe directory and execute the following commands.

gacutil /u DevExpress.Charts.v10.2.Core
gacutil /u DevExpress.Data.v10.2
gacutil /u DevExpress.PivotGrid.v10.2.Core
gacutil /u DevExpress.Utils.v10.2
gacutil /u DevExpress.Web.ASPxEditors.v10.2
gacutil /u DevExpress.Web.ASPxGridView.v10.2
gacutil /u DevExpress.Web.ASPxScheduler.v10.2
gacutil /u DevExpress.Web.ASPxThemes.v10.2
gacutil /u DevExpress.Web.ASPxTreeList.v10.2
gacutil /u DevExpress.Web.v10.2
gacutil /u DevExpress.XtraCharts.v10.2
gacutil /u DevExpress.XtraPivotGrid.v10.2
gacutil /u DevExpress.XtraPrinting.v10.2
gacutil /u DevExpress.XtraReports.v10.2
gacutil /u DevExpress.XtraReports.v10.2.Web
gacutil /u DevExpress.XtraRichEdit.v10.2
gacutil /u DevExpress.XtraScheduler.v10.2
gacutil /u DevExpress.XtraScheduler.v10.2.Core

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