I have a .inp blade model that was built on Abaqus v6.11. I imported it in Abaqus v6.13 and this warning message appeared:

WARNING: Node-based surfaces are not yet supported in Abaqus/CAE. The following node sets have been created in place of the corresponding node-based surfaces so they can be used in Abaqus/CAE. 

And a long list of node sets created and corresponding node-based surfaces was given

Can anybody help me understand how to fix this?