Can't log on using mobile devices

Does anybody know why I can’t log on to this forum using my Android phone or tablet? Every time I do, I get a “Runtime Error” which is “gobble-de-goop” as far as understanding it. I have two email accounts listed with trains.com, but neither works from mobile. I can READ the forums, but I can’t log-in to reply. Any ideas?

I get about the same message with two different iPhones. Tried a few times the past three years and no joy. I wait until I get home and use the PC. Not a big deal.

Rich