A connection has less than two ports.
A connection has less than two ports: Missing one or more ConnHasPorts relationship(s) to StructPort for StructPhysicalConnection, AssemblyConnection, StructConnection. In other words, the connection does not have two ports.
What You Should Do
Open the model.
In the Molded Forms task:
If it is a user-defined connection, select the connection, and add a port.
If it is a generated connection, delete the object. It will automatically be re-created.
Re-run the Check Database Integrity custom command and the DBIntegrity report.
If the object is still posted, contact Smart 3D Support.