First, try Xcode 8 and see if you get the same issue. Also, are you making ANY changes after exporting?
this issue because "PTModelGeneralSettings::shared();" in this line PTModelGeneralSettings *generalSettings = PTModelGeneralSettings::shared(); retuen NULL , and i don't know why ?
I've never seen this issue you are facing before. Best to send you BBDOC and a description of the issue to support@buildbox.com so we can take a closer look at what is happening.