Error when predicting contacts for heterodimer

[AnjaliSetiya]

I am trying to follow the tutorial on contact prediction from esm example files
https://github.com/facebookresearch/esm/blob/main/examples/contact_prediction.ipynb
but i have some multimeric proteins also, as there is not much info available for those, i follow the steps as mentioned for esmfold that is to use a ':' seperator.
. But when trying to predict contacts
.
It doesn't accept the seperator, Let me know how do we predict contact probablities,/contact predictions for multimeric proteins. how should fasta be given for the same.