I'm not an expert but... To see methods in a crash report your machine needs to have a table of symbols from the app. Did you build the app in Xcode on your Mac? I believe there's a DSYM (debugger symbols) file generated when you build that holds a table of the symbols so that you can open a crash report in the Xcode > Organiser and see the addresses symbolicated to objects to get a better sense of what is happening. This is all off the top of my head so [citation needed] but the short version is you need the symbol files. If you didn't build the app on your Mac then that;s why you're missing object names.
Heres a link to Debugging Deployed iOS apps guide. And one to the parent with all the debug info