❔ c# unity error

in unity i am getting this error here:

Feature `declaration expression` cannot be used because it is not part of the C# 6.0 language specification

Feature `declaration expression` cannot be used because it is not part of the C# 6.0 language specification

the full code is here: https://pastebin.com/KzChaicv, line 35.
can someone please help me?