For example, suppose the master side is an i-edge of the mesh starting at full index node 1 and ending at full index node 11. This is an edge along 10 elements.
Now suppose the slave side edge starts at full index 5 and ends at full index 14. This is an edge along 9 elements. There is no way to form a 1 to 1 correspondence between the nodes along the master and the slave edge.
The easiest way to correct the problem is outlined below.
1. put an interrupt command after the bb command for the slave side
2. run in batch mode and when it becomes interactive, the warning
message will tell you the number of nodes on both sides of the interface.
3. for more information, execute the bbinfo command.
4. use lmseq command to add/subtract elements to/from the slave part so that the two sides are compatible.
