mouse = player:GetMouse() nil value?

Im trying to get player's mouse position. But im getting ServerScriptService.DamagableManager:48: attempt to index local 'mouse' (a nil value) error

LocalScript that im trying to connect to Server Script:

local function onMousedClicked(actionName,inputState, inputObject)
    if inputState == Enum.UserInputState.Begin then 
        CheckIfDamagable:InvokeServer()
        print("MouseClicked")
    end
end

server Script that im tring to get mouse info:

function CheckIfDamagableObject(player) 
     local mouse = player:GetMouse()

    --Unrelated codes here

end


CheckIfDamagable.OnServerInvoke = CheckIfDamagableObject