Error: The type 'FileIOPermission' exists in both, System.Security.Permissions and mscorlib

[scrapHandler]

Hi,
after installing Amazaon GameLift Server SDK 5.1.0, I get the error:

Library\PackageCache\com.unity.services.core@1.12.0\Editor\Core\Configuration\ProjectConfigurationBuildInjectorWithPlayerProcessor.cs(51,50): error CS0433: The type 'FileIOPermission' exists in both 'System.Security.Permissions Version=7.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' and 'mscorlib Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

System.Security.Permissions Version=7.0.0.0 is used by Amazaon GameLift Server SDK 5.1.0.
mscorlib Version=4.0.0.0 seems to be part of Unity or .Net
com.unity.services.core@1.12.0 is used by "com.unity.services.cloud-diagnostics 1.0.6" and "com.unity.purchasing 4.10.0"

What can I do? (Without removal of cloud-diagnostics and purchasing package)

[wenxiul]

Hi, @scrapHandler
are you using a compatible Unity editor (2021.3 LTS, 2022.3 LTS)? Please have Windows Dedicated Server Build Support module installed by going to Unity Hub -> Installs -> click on the gear button on the right of your editor -> Add modules and see if the issue resolves!

[scrapHandler]

Hi @wenxiul , thx for your answer!

I'm using Unity 2022.3 LTS and want to build for Linux Server.
And I have all modules installed, including "Windows Dedicated Server Build".

But this did not solve my problem. What I did was, to setup it on my own, with downloading the required dll's from nuget and for System.Security.Permissions.dll I unchecked "Auto Reference", which did the trick.

[JonghaShin]

Hello, I got a same problem.

How can I fix it?