File is overwritten when starting a sequence

This message appears before I start a sequence:
"the subdirectory specified for the sequence already contains data files. If you start the sequence the files may be overwritten if running acquisition. Use the 'sequence parameters' to change the subdirectory or check the file names are different"
I have already changed the subdirectory to a new one, and the file names are always different, we add time and date and we still get this message
We are using OpenLab CDS 2.3.53

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