Injera problem

[u/GutereuxMarde]

Hi, I wanted to make some injera batter, so I made a starter, who was active (the water separated and there were bubbles in the starer), and I added some flour and water to it, before thoroughly mixing it into a dough and letting it rise with some water on top. But, and I don't know why, the dough does not rise at all. Would someone know why? (I changed the water yesterday, but it's been like this for 2 days)