Assets\Scripts\CombatScript.cs(188,44): error CS0136: A local or parameter named 'duration' cannot be declared in this scope because that name is used in an enclosing local scope to define a local or parameter

[facybenbook]

i downgraded the project to unity 2019 and i got the following error : Assets\Scripts\CombatScript.cs(188,44): error CS0136: A local or parameter named 'duration' cannot be declared in this scope because that name is used in an enclosing local scope to define a local or parameter

could you tell me how i can fix it please

[FuzzyBoots]

It's probably referring to the definition at 179. You might try renaming "duration" to something else in the parameter list and body of CounterCoroutine.