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Try this link and dig through the comments and you'll find someone with 5he same problem
http://www.planetminecraft.com/mod/spinos-vehicles---content-pack-for-the-flans-mod/
This is something to ask in flan's mod thread:
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/1272467-flans-mod-4-9-0-zombies-helicopters-mechas-planes
Try this link and dig through the comments and you'll find someone with 5he same problem
http://www.planetminecraft.com/mod/spinos-vehicles---content-pack-for-the-flans-mod/