So flash is thinking the plug is stripped. If it's the thread into oil pan, then you might try a heli-coil or time sert...or you might also find a slightly larger drainplug and tap for that.
You might also find that just wrapping with teflon tape might seal it up...or if you have enough bite, you might just try sealing with rtv, letting it cure, then filling with oil. Obviously, if trying rtv, you need things clean...and you need the right kind of rtv that has oil resistance.
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Mangofy your E46!