Many people who have received above message can no longer access iPhone's message app. And many article on internet mentions that you can fix this by sending back a reply to the original sender (or original sender must send some other normal message).
There are number of methods to try sending a message mentioned by online articles. Unfortunately none of them worked for me. Including SIRI method, Image sharing method etc.
However I found this app called Unshortener , which has an option to send an SMS. And this app previews the message history of your Message App when a sender's name typed in the "To:" field! (see pic 2)
All you have to do is , go through all the people's messages who sent you that 'crash message' and send them back a normal message ( something like "test"). Then it will magically fix everything and you will be able to open Messages app again.
