Here is the error when attempting to load Sign Artist. Server is on Debian 10 running Oxide 2.0.4762 and the plugin has been working perfectly up until the 1.2.5 update.

Added '// Reference: System.Drawing' in plugin 'SignArtist'
Error while compiling: SignArtist.cs(783,22): error CS0433: The imported type `Steamworks.InventoryDef' is defined multiple times​

Your server has multiple Steamworks DLLs installed. This isn't really a plugin issue. 

Facepunch.Steamworks.Win64.dll
Facepunch.Steamworks.Posix.dll

Thanks!

plugin probably needs an update

SignArtist - Failed to compile: SignArtist.cs(783,22): error CS0433: The imported type `Steamworks.InventoryDef' is defined multiple times

Your server has both the Steamworks Facepunch.Steamworks.Win64.dll and Facepunch.Steamworks.Posix.dll files, you only need one. If you are using a host, they likely installed this erroneously. Deleting the file not relevant to your OS under RustDedicated_Data/Managed would fix the issue.

This is not a plugin issue.

thanks, will try to remove one. i host the server myself and it worked just fine before this update. the file (posix) was installed automatically with this update. i have 25 plugins and this one was the only one failing so i was sure it had to be a plugin problem.

The Posix file would only be installed if you have a Linux server or manually installed something that included that.

my bad, mixed it up. i meant the win64 file is the one that somehow got added (am on linux, file was modified this update) but i only have my scripts that update the plugins, rustio and umod. also i did not install anything manually because my server is completely automated since one year. however thanks, will just remove the win64 file!