As of version 1.0.54 (out for everyone now on Google Play) this is fixed.
As of version 1.0.53 (in beta, right now) we have suggested edit functionality and it happens seamlessly when you're editing but have to suggest instead.
I think I know what's happening here: The Stack Exchange API (which our official app also uses) doesn't offer the ability to submit your edits into an edit queue, so if you don't have enough reputation to flat out do an edit (in which case on the site you'd just be allowed to edit, but it'd go into the queue for validation), you get an error message.
If this is what happened, then you didn't do anything wrong it's just that our API doesn't have feature parity with the website yet, sorry about that.