Remember, the final product is everyone's goal. Build in time in your schedules for unexpected delays. Because a group project may be of short duration you don't have much leeway time, it is possible to be in contact with your group frequently, so unforeseen glitches should be taken care of immediately. Learning how to make these connections is a foundational element upon which you build a good product. Writing isn't magic and it doesn't depend on luck.
Writing is work.
In a collaborative project, writing is working together. Explore how you can use this tool. If at any time there is a problem in your group that you can not solve by yourselves. Please, please let me know about it so that I can help with solving the problem.