MouseKeyHook "strong name required"

I implemented an application which uses the Nuget package MouseKeyboardActivityMonitor. Everything was working fine so far. I now wanted to build a Setup Project to deploy the application on other computers. Therefore I had to sign my project. Since then I cannot built the project anymore as it says (Translation from German to English):

"The file or assembly 'MouseKeyboardActivityMonitor ...' or a dependancy was not found. An assembly with a strong name is required. (xception from HRESULT: 0x80131044)".

Does anybody have an idea how to give this third party package a strong name so I can built the project again?