Blackberry app special chars and text too much long

I have a BB app that use .net web services for retrieving info from database and showing them to the user. Some times happens that it gives error. Because it happens only for some text (the same info are retrieved correctly by the web service so is a problem about displaying on the phone) I think that the problem is caused by special chars or by text too much long. The app is developed for 2 OS releases: 4 and 5. The source code is on Bitbucket.