I've been having the same experience!

I was up all night tryna figure out what was goin on.

I had been using the blockchain app for the pass 3 months
with no problems until lastnight.

I click the app and it prompted me to enter PIN, as
I always do, but for whatever reason this one time
I decided to send a few btc using this app at that
precise moments got an " error 157 'Unknown error code'

Now my btc is tied up in the process!