there is a known bug in the texting component
it has been fixed by Evan, but there still was an issue, as @Anke tried to explain earlier
but now it should work on the test server here http://nb190a-bugfixes.ai2-ewpatton-temp.appspot.com/
if you want to test it using the companion app, you have to download the corresponding companion app for that test server... from the menu click Help - Companion Information and download the companion app from there. The new companion number should show 2.65d2u, see also Runtime Error: Targeting S+ (version 31 and above) requires that one flag of FLAG_IMMUTABLE be specified[...] - #33 by ewpatton
Taifun