'Pyflakes E on defining a variable

I'm defining that a variable equals another variable and I'm getting Py flakes E for F13x. Anyone knows why? The others variables are defined above on the code and I don´t think the problem is related with them.

Code:

F12x = (comb_a1n * lasna / 2) * mt.sin(alfa)
F13x = F12x

python pyflakes

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'Pyflakes E on defining a variable

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