I was browsing XF.com on the default android browser. (Android 4.2.2) I received a floating notification on my screen to alert me that a new conversation message was received. I tapped it to go to the message. Instead of going to the message I was taken to an empty inbox, with a red error message floating, stating that an error had occurred. No further info.
Normally that simply pops open the menu (if it's displayed). If it's not, it does try to take you to the page in question.
However, I'm a little unclear on what the error was. Ideally, I'd need to know the exact URL you ended up at and the exact error message - a screenshot would be helpful (though obviously it's tough to get now). Any more info would help us understand the report.