error CS0120

Weapon.Damage line:

UpgradeMenu Script:

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.UI;
3. using System.Collections;
4.  
5. public class UpgradeMenu : MonoBehaviour {
6.  
7.     public GameObject upgradeMenu;
8.  
9.     public static bool upgradeMenuEnabled = false;
10.  
11.     public GameObject pressToUpgradeMenu;
12.  
13.     public GameObject moneyText;
14.  
15.     public Button buttonHealth;
16.     public Button buttonSpeed;
17.     public Button buttonDmg;
18.  
19.     [SerializeField]
20.     private int startingMoney;
21.     public static int Money;
22.  
23.     public int dmgToBuy;
24.  
25.  
26.     void Start ()
27.     {
28.         upgradeMenu.SetActive(false);
29.  
30.         pressToUpgradeMenu.SetActive(true);
31.  
32.         moneyText.SetActive(true);
33.  
34.         Money = startingMoney;
35.  
36.         buttonHealth.interactable = false;
37.         buttonSpeed.interactable = false;
38.         buttonDmg.interactable = false;
39.     }
40.  
41.     void Update ()
42.     {
43.  
44.         if (Money >= 100)
45.         {
46.             buttonHealth.interactable = true;
47.         }
48.  
49.         if (Money >= 50)
50.         {
51.             buttonSpeed.interactable = true;
52.         }
53.  
54.         if (Money >= 100)
55.         {
56.             buttonDmg.interactable = true;
57.         }
58.  
59.         if (Input.GetKeyDown(KeyCode.U))
60.         {
61.             pressToUpgradeMenu.SetActive(false);
62.  
63.             if (upgradeMenuEnabled == true)
64.             {
65.                 upgradeMenuEnabled = false;
66.                 upgradeMenu.SetActive(false);
67.                 moneyText.SetActive(true);
68.                 Time.timeScale = 1f;
69.             }
70.             else {
71.                 upgradeMenuEnabled = true;
72.                 upgradeMenu.SetActive(true);
73.                 moneyText.SetActive(false);
74.                 Time.timeScale = 0f;
75.             }
76.         }
77.  
78.         if (Input.GetKeyDown(KeyCode.Escape))
79.         {
80.             if (upgradeMenuEnabled == true)
81.             {
82.                 upgradeMenuEnabled = false;
83.                 upgradeMenu.SetActive(false);
84.                 moneyText.SetActive(true);
85.                 Time.timeScale = 0f;
86.             }
87.         }
88.     }
89.  
90.     public void closeUpgradeMenu()
91.     {
92.         upgradeMenuEnabled = false;
93.         upgradeMenu.SetActive(false);
94.         moneyText.SetActive(true);
95.         Time.timeScale = 1f;
96.     }
97.  
98.     public void UpgradeHealth()
99.     {
100.         if (Money >= 100)
101.         {
102.  
103.         }
104.     }
105.  
106.     public void UpgradeDmg()
107.     {
108.         if (Money >= 100)
109.         {
110.             Weapon.Damage += dmgToBuy;
111.         }
112.     }
113. }
114.  

 

Use this.Damage instead.

 

the script doesn't contain a "Damage" variable...

If you are trying to upgrade the currently equipped weapon you need to have some sort of reference, or a means to gain that reference (i.e. reference to current player which can be used to gain a reference to it's current weapon).

 

Oh, sorry about that .

You need a reference to an object, or if all your weapons do the same damage, you can declare Damage as static.

 

is just one weapon

 

Just put "static" in the declaration then. Though, I'd advice you to learn whether a variable is a class member or an instance member, more generally about variable scope. It's part of the fundamentals of Object Oriented Programming (OOP).