CPP0610022E This data set already exists.

Explanation
You entered 'Y' for "Allocate a new file system
data set," but the data set name you specified already exists.

System action
None

System programmer response
Do one of the following:Specify a unique name for the new data set
Delete or rename the existing data set and then return to the
panel and proceed
Specify "N" for "Allocate a new file system data set" to
use the existing data set.