I should have the symbolicate from my device. I followed the instruction from http://jmillerdev.net/symbolicating-ios-crash-files-xamarin-ios.
I created the alias
for Xcode 8
alias symbolicate="/Applications/Xcode.app/Contents/SharedFrameworks/DVTFoundation.framework/Versions/A/Resources/symbolicatecrash -v"
I updated the developer directory
export DEVELOPER_DIR="/Applications/Xcode.app/Contents/Developer"
and then the symbolicate
symbolicate -o "symbolicatedCrash.txt" "MyAppName 2-12-14, 9-44 PM.crash" "MyAppName.app"
but I have an error
Symbolicating myInventories170313.crash ... while reading myInventories170313.crash, No such file or directory : at /Applications/Xcode.app/Contents/SharedFrameworks/DVTFoundation.framework/Versions/A/Resources/symbolicatecrash line 899.