Is it:
W010a0074
No version found for filename or pattern: %s1.
Reason:
A version that matches the filename or pattern specified at the hco command line check-out cannot be found.
Action:
Correct the filename or pattern specified for hco if they are misspelled, or remove the filename or pattern from hco if there is no version that matches the filename or pattern.
?
That depends on your actual data.
Maybe it is the error I often do: specifying the viewpath with the wrong slashes. They have to be backslashes although we are working with Unix.
HTH
-Hans-Arno