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Isn’t that the editor script for a standard asset? How did you manage to break that?
The script is missing an opening curly bracket after the namespace delcaration. It should be in line 6.
Furthermore it looks like you somehow messed up the classname inside the attribute. I’m pretty sure it should be:
typeof(Antialiasing)
and not
typeof(Intialiasing)
Next time don’t post errors and code as images. It’s messy and complicated for us to follow your question. You can select error messages in the console window and copy&paste them. Same for and code. Make sure you highlight the code correctly. You might want to take a look at the userguide
Also pure debugging questions should be posted in the help room and not in the default space.