Error in detrenddata

[vicentinstefano]

During preprocessing, when I launch hmmprocess to detrend / standardise my data (but also later, if I do not perform these processes), it seems that Matlab is unable to read the data.X field of the variable data. This happens both if I give it the variable in the cell format and if I give the matrix directly.
Here is an instance of the script and the resulting error:

[data,T,options] = hmmpreprocess(data(sub),T(sub),options);

Error in line 108: Index in position 1 exceeds array bounds (must not exceed 1).

Error in detrenddata (line 6)
data.X(ind,:) = detrend(data.X(ind,:));

Error in hmmpreprocess (line 107)
data = detrenddata(data,T);

Any suggestions on how to solve this?
Thanks!