Scripts from standard asset are not loading

I downloaded the standard assets 2017 from unity. I uploaded them to my project. I keep getting the error “The associated script can not be loaded. Please fix any compile errors and assign a valid script.” However I haven’t touched the script since downloading it.Additionally when I try to move a script to my object I get the error "Can’t add script behavior.please help me

What version of unity are you using? It sounds like the scripts are not compatible with the version you are using. If this is the case you will have to modify the scripts to be compatible with the version changes. This can be easy or hard depending on the script and what changed between versions.