WoWInterface - lockButton:SetText

By looking at the screen shot you can see the error for line 21...I fixed that with the code below. Also you can see the sword with Runes.

Code:

        -- Button to lock/unlock runehero

        local lockButton = CreateFrame( "CheckButton", "lockButton", rhOptions, "SettingsCheckBoxControlTemplate");

        lockButton.text = _G["lockButton".."Text"];

        lockButton:SetText("Lock RuneHero");

        lockButton:SetPoint("BOTTOMLEFT", titleString, 0, -40);

        lockButton:SetScript("OnClick", RuneHero_Lock );

        lockButton:SetChecked(true);

But upon applying this fix is does eliminate the errors and allows for the settings to show up in the Options Tab, but the Sword disappears.

https://imgur.com/a/uNmdEON

Is there something I'm overlooking?