In common terms, the flow of a map is describing how a map feels while navigating through it. Some cases which effect the flow are:
When a map has no flow, it means most of the times that it lacks some of the criteria which is listed in the next couple of aligns. Keep in mind that when you ignore some of the criteria, you may risk some serious flow issues on your map.
When possible, you should use an Open Source Initiative approved license. DO NOT use another person's work without permission! If this is not the case, read the comment of an Administrator or Moderator on your node that explains the licensing issue.
Refer to the Packaging Guide for information on how to fix this.