Create a different library an import to that library. The message you are getting is that catalogs in the stc file have the same name as catalogs you are 'using' in you current session. Send them elsewhere and the conflict will go away.
Since you had created a library datain I thought that was where you were going to import the stc to but you instead used work as the library in cimport.
BTW do not be surprised if after you get them imported you have some issue with "catalog was made in a different operating system".
If the purpose of this exercise is to recover macros I would suggest trying to find the code would be a good idea.
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