Can't continue to level 2.1 and 2.2

[Dreifach]

After playing some missions in 1.1 and 1.2 in different difficulties and winning this stage 1 battle, i can't start the next missions. The butten stays grey.

What am i doing wrong? Couldn't find a hint or something.

Thanks
This game is awesome!

 

[MikeSlugDisco]

You need to select a unit variation. Wood ants have two options - rapid fire and mortar. Choose one of those two icons then you'll be able to progress

 

[Dreifach]

Yes...it worked :. Thank you.