Invalid token in class, record, struct, or interface member declaration. Tuple must contain at least two elements. Why this error are coming?

Question

Now Visual studio is giving the Invalid token error on the assignment sign (=) (as per the title), and I can not see why.

• error CSI 519: Invalid token in class, record, struct, or interface member declaration.
• Invalid token '(' in class, record, struct, or interface member declaration.
• Tuple must contain at least two elements.
• Invalid token in class, record, struct, or interface member declaration.
  

Answer 1

It looks like this error happens due to version of your MSBuild, an old version of MSBuild can only compile C# version 4.
error happens due to wrong use of argument in line number 21.

In line 21                      if(other.gameObject.name = "Ball").
Replace the code with if(other.gameObject.name == "Ball").