What does this error mean: Builtin_Function_or_Method ‘Object Is Not Subscriptable?

Here is the code for the context:

This program should add numbers with rigs from 0 to 50 to the 10th calculus system.

```
Def Plus (Num1, Num2, Base):
p = 0.
Num_tab = '0123456789Abcdefghijklmnopqrstuvwxyz + - / 8 = ~! @ # # No. $% ^ & amp;?
New_num = ''
Min = min (len (num1), len (num2))
Max = Max (Len (Num1), Len (Num2))
i = 0.
IF LEN (Num1) & GT; Len (Num2):
Max = Num1
MIN = Num2.
Elif Len (Num1) & lt; Len (Num2):
Max = Num2.
Min = num1
ELSE:
Max = 0.
IF MAX - MIN & GT; 0:
B = MAX - min
ELSE:
B = 0.
DEF SUM (Num1, Num2):
a = num1 + num2 + p
IF A & GT; Base:
P = 1.
Return Num_Tab [A - BASE]
ELSE:
p = 0.
RETURN NUM_TAB [A]
While min:
Min- = 1.
New_num = SUM (num_tab.find [num1 [i]], num_tab.find [num2 [i]]) + new_num
I + = 1
While B:
IF P:
New_num = num_tab [num_tab.find [num1 [i]] + p] + new_num
p = 0.
ELSE:
New_num = num_tab [num_tab.find [num1 [i]]] + new_num
Return new_num
```

## Answer 1, Authority 100%

You do not properly use the `Find `

Place `Find [] `

You need to write `find () `