You are missing one "}" at the end to close it and also the file name (I dont think there should be .bpo at the end of it)

// MISSIONS CYCLE (see below)
class Missions
{

class Evolution // name for the mission, can be anything
{
template = EvolutionB2_TGP_Unranked.Sara;
cadetMode = 1; // difficulty 0=veteran 1=cadet (not only AI, but radar, map etc)
};

};

And sorry for the double post.

No problem :)