nevermind...
yesterday, I changed back and forth between styles and the error was reproduced each time...
use a bootstrap style = error
use any style other than a bootstrap style = no error.
I could rebuild app, re-start asprunner,.. whatever. No matter what I did, the error was consistent and reproducible.
Today I came in and made a fresh build to upload to demo account.
oops... no error
This app is jinxed. I recently had another error in it. I wound up creating four versions of the app; each from scratch. Two had the same error; two did not.
... go figure