Euro Cup Qualification Rules

I play Cm/Fm for 15 years and just a few minutes ago very strange thing has happened.

I have been playing a league with Basingstoke and managed to reach to Premier league. But I was unsuccesfull and relegated from the league by becoming 20th.

Then for the start of the next season, very weird thing happened and My team seems to participate in Euro cup.

I eleminated in the third round both in the Capital Cup and FA cup.

I can't explain this and wonder if it is some kind of bug or if there is a rule that i don't know

I know some teams get into the europa league in real life through a fair play league but that is all i can think of. Like this http://en.wikipedia.org/wiki/UEFA_Respect_Fair_Play_ranking#Ranking

I guess that might be the case. I had thought this situation before and you confirmed my thoughts. I really didn't have a red card for all the season and number of yellow cards was really low. So thanks for the reply. I think that solved it.