error while running 2PL in Item Response Theory


I am trying to run following command, which through an error. can some one help?

Male2PL <- mirt(mydata1[1:2651,], 1, "2PL", SE=TRUE)
Female2PL <- mirt(mydata1[2652:5352,], 1, "2PL", SE=TRUE)

Error: The following items have only one response category and cannot be estimated: Gender

data frame as follows:

Thanks in advance,

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