Error message when running

Hi! I hope you will be able to help me. I'm modelling a Discrete Choice Experiment and I need to transform my dataset from a wide to a long format. In fact, I succeed by running :

C <-, shape="wide", choice= "choice", varying= 5:24, sep= "_", alt.levels=c("A", "B"), id= "id")

However, this morning, I tried to run my model again and I received an error message which is the following:

"Erreur : Assigned data ids must be compatible with existing data.
x Existing data has 1560 rows.
x Assigned data has 780 rows.
i Only vectors of size 1 are recycled."

But, I don't understand why ! Do someone already had this error message and solved it ?

Thanks in Advance!

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