Problem with HB analysis

Hello,

I'm currently trying to run the HB analysis in my data . However, the following message comes every time and no results are shown:

"The following value is not a valid Respondent Number:
2
(Respondent Numbers must be unique)"

I don't understand why number 2 is not a valid respondent number. I check the data and I can't figure it out, where the problem might be since in the data is shown that each respondent has a unique number. Do you know whether there is a mistake or how could I fix it?

Thank you very much in advance!

Resolved
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