A weird error message

Question

A few moderators from Stack Exchange communities decided to go "old-school" and developed a desktop application for Stack Exchange. You, as an enthusiastic user, of course want to try it out. Everything worked fine for the most part, but suddenly an error dialog pops up:

_{Note: The typo in "occurred" is unintentional, maybe I will fix it later, but it isn't important to the puzzle anyway.}

Apparently the developers have a sick kind of humor... But you decide to play along. You must figure out what the exception is, and judging by the last sentence of the message, you're not allowed to view the source code (which should be obvious anyway...).

The grid also seems to be important. It's made of 7 rows and 7 columns, and a gray object is moving across the grid, stopping & blinking at specific coordinates.

List of points where the object stops (in order):

3,2
4,6
1,4
5,5
4,5
2,4
4,7
4,5
4,3
5,4
2,5
4,4
5,5
4,1
4,4
4,5
7,4
2,3
4,6
3,2

---

Hint:

The developers like to proudly show everyone that they're the mods of SE communities.

---

What is the actual exception the error dialog is trying to display?

Answer 1

The clues in the question

• From the paired-up nature of the enciphered message, and also the words "stay fair" in the text of the error popup message, I concluded that

  this is something to do with the Playfair cipher.

• This cipher needs a key, and my best guess at the key is, in true West-Gate-of-Moria fashion,

  MYFRIEND, because then the phrase "I want you to stay fair, my friend" in the text of the error popup is a double clue rather than just one.

• The hint now added to the question gave me the idea of

  using a diamond shape somehow, since SE moderators all have diamonds next to their usernames.

• The OP also mentioned, after I'd posted the first version of this answer (attempting to use the above-mentioned cipher directly on the cells of the 7x7 square provided in the question), that

  the Playfair part of the solution is to be done using a standard 5x5 square, and the ciphertext first needs to be found using the 7x7 grid provided.

The solution method

First,

write out the alphabet (missing J, as is standard in Playfair ciphers) in a diamond within the 7x7 grid provided:

* * * A * * *
* * B C D * *
* E F G H I *
K L M N O P Q
* R S T U V *
* * W X Y * *
* * * Z * * *

Then the given sequence of cells:

32 46 14 55 45 24 47 45 43 54 25 44 55 41 44 45 74 23 46 32

becomes

E P A U O C Q O M T D N U K N O Z B P E.

Plug this into

a standard 5x5 Playfair square with the key "my friend" (this can be done quickly using the online tool here, or you can do it by hand to check)

to get the final solution:

NO EXCEPTION EXCEPTION.