brutal doom v20 error

Hey guys I updated my zandronium to v2.0 and my gzdoom is 2.1 pre.
While running brutal doom v20 i get error:
Execution could not continue.

Script error, "brutalv20.pk3:cvarinfo" line 1:
cvar 'bd_bloodamount' already exists

any help would be great!

Make sure you don't autoload any other mods (for example an older version of BD) along with BD v20.

im not loading other mods just brutal doom v 20 and doom.wad to try in ultimate doom.
still get the same error!!
but after launching it with rocket launcher it did work!
and thats with other mods doom metal v4 and some older wads!
ok thanks guys

Zandronum 2.0 has a retarded error involving CVARS. Try clearing the cvars from your zandronum INI file and then load it.

Also make sure you don't have a copy of BD or any other mod in your skins folder.

For anybody running the latest doodle broom you need to edit your keyconf if you plan on using the vanilla character. Add VanillaBFG9000 to setslot 7.

I get this message:

Script error, "brutalv20.pk3:spiders.txt" line 244:
Replaced type 'PlasmaBall2' not found in EnemyPlasmaBall

any help will do.

EDIT: nevermind. I got it working, and holy shit it's awesome!!!!!