Idk why some comments make biber failbiber

#@InProceedings{kotsiantis2003,
#author="Kotsiantis, S. B.
#and Pierrakeas, C. J.
#and Pintelas, P. E.",
#editor="Palade, Vasile
#and Howlett, Robert J.
#and Jain, Lakhmi",
#title="Preventing Student Dropout in Distance Learning Using Machine Learning Techniques",
#booktitle="Knowledge-Based Intelligent Information and Engineering Systems",
#year="2003",
#publisher="Springer Berlin Heidelberg",
#address="Berlin, Heidelberg",
#pages="267--274",
#isbn="978-3-540-45226-3"
#}