I've had the same issue when trying to deploy from RStudio Cloud to shinyapps.io. I tried downloading an app that is currently on shinyapps.io and deploying from RStudio Cloud:
"Error in data.frame(Source = source, Repository = repository) :
arguments imply differing number of rows: 1, 0"
Same download, deploying from RStudio v 1.2.5019 under macOS10.12.6:
"Application successfully deployed".
Deploying from RStudio Cloud worked fine for me a few days ago.