I tried for 5 days to 'coax' a meeroo out of his nest but I keep getting this error message:
"Could not rezz the baby meeroo (parcel full?) Please try again later!"
The parcel was not full - we have 133 prims remaining and even freed up more space but the same message keeps appearing. I was wearing my HUD, I had the proper land group activated, there was room available in the stump the nest was next to, and there was food available. I just could not get this meeroo out - same message every time.

SOLUTION that worked for me:
Had a suggestion work from a helpful person in support chat - give broken nest to an alt/trusted friend and have them coax it then give the meeroo back.
This has worked for me and one other person this very night!
Hope it works for you!! :D