Character Stats not loading on PLAYER_LOGIN

[Seethe]

Hello, I am new and noob to WoW addons development.
As an exercise I am trying to do a little panel with player stats in it, but actually I am failing to do so
With the following code, when I enter into the game my stat is 0.000.
Any help? Thanks in advance!

function round(number, decimals)
        return (("%%.%df"):format(decimals)):format(number)
    end
 
    local crit = round(GetCritChance(), 3)
 
    local c = CreateFrame("Frame", "myframe", UIParent)
 
    c:SetWidth(400)
    c:SetHeight(200)
    c:SetPoint("TOP", UIParent, "CENTER")
    c:SetFrameStrata("MEDIUM")
 
    c.tex = c:CreateTexture()
    c.tex:SetAllPoints(c)
    c.tex:SetColorTexture( unpack(cfg.color))
 
    c.text = c:CreateFontString(nil,"ARTWORK","GameFontNormal")
    c.text:SetPoint("TOPLEFT",8,-10)
    c.text:SetTextColor(classColor.r, classColor.g, classColor.b)
 
    c:RegisterEvent("PLAYER_LOGIN")
 
    c:SetScript("OnEvent", function()
       c.text:SetText( "Crit: " .. crit )
    end)