Spread - Formula error


Good morning, possibly my question is a bit stupid but I can't find the reason why a formula was created;
Spread = ((Ask-Bid) / Bid) * 100

Appreciation or Valorization = (Delta () / Ask) * 100

VTarget = (15 / ((Delta () / Ask) * 100))

In my Demo account they give me information and yet in my anchored account it gives me the following NAN data,
I would appreciate if you can help me see where the error is.

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