Could not load type 'System.Object' from assembly 'System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' because the parent does not exist.

Aditya Dalai 25

Previously my application was build on .net framework 4.8 and the setup has done by using wix toolset version 3.11.2 . due to some reason we have migrated some of the component into .net .standard 2.0 and one of the project in to .net 6 because it was a console application. and we are able to build and the application using visual studio.

<Component Id="_COMP_Data_UI_dll" Guid="{b55258eb-3a2a-4575-afd1-1385beb03c01}">
				<File Id="_FILE_Data_UI_dll" Name="Data.UI.dll" KeyPath="yes"  Assembly=".net" AssemblyManifest="_FILE_Data_UI_dll" AssemblyApplication="_FILE_Data_UI_dll" DiskId="1" Source="$(var.SourceDir)\Data.UI.dll" />
			</Component>

since .net 6 doesn't support AssemblyManifest, Assembly attributes in wix I have removed those attributes. <Component Id="_COMP_Data_UI_dll" Guid="{b55258eb-3a2a-4575-afd1-1385beb03c01}"> <File Id="_FILE_Data_UI_dll" Name="Data.UI.dll" KeyPath="yes" DiskId="1" Source="$(var.SourceDir)\Data.UI.dll" /> </Component> now when I create the setup ,I am able to create and after installation i got a message that Could not load type 'System.Object' from assembly 'System.Runtime.dll version 6.0.0.0" in the event viewer when I manually put System.Runtime.dll version 6.0.0.0 inside the gac a different error is coming, saying that Could not load type 'System.Object' from assembly 'System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' because the parent does not exist. User's image

I have tested through visual studio 2022 it is working fine only during installation it gives error in this below line which is in a .net standard 2.0 application . User's image

Jiale Xue - MSFT 45,006 Reputation points Microsoft Vendor

2023-04-10T10:10:36.1633333+00:00

Hi @Aditya Dalai , Welcome to Microsoft Q&A. Have you tried putting both System.Private.CoreLib and System.Runtime.dll into the GAC, will that fix the issue? I prefer to install System.Runtime directly using Nuget Manager.
Aditya Dalai 25 Reputation points

2023-04-11T05:10:57.3566667+00:00

hello @Jiale Xue I have tried by taking the particular nuget package that you suggested , but still the error is there , but when I migrated .net 6 I havn't check anything in wix for checking weather .net 6 is there in client machine or not ,if not then install, currently I am using this wix as part of my setup

is that causing the problem ?
Jiale Xue - MSFT 45,006 Reputation points Microsoft Vendor

2023-04-25T09:48:16.1333333+00:00

Hi @Aditya Dalai , you cannot keep two runtimes of different versions but with the same name in the installation package. This causes installation conflicts. You may need to create a different installer or setup corresponding application configuration file (app.config) for each version.
Jiale Xue - MSFT 45,006 Reputation points Microsoft Vendor

2023-04-28T09:10:26.1266667+00:00

This forum does not support Wix-related issues. I suggest you ask on Wix's support forum.
Gopi Krishna 0 Reputation points

2024-08-12T17:25:50.3166667+00:00

@Aditya Dalai I am also facing same issue. Did you find any solution?

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Could not load type 'System.Object' from assembly 'System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e' because the parent does not exist.

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