I'm trying to get yeast and human protein sequences, and the human one works, but yeast doesn't - anyone know what's going on? Here is my code:

>>> server = pybiomart.Server(host="http://www.ensembl.org")
>>> mart = server["ENSEMBL_MART_ENSEMBL"]
>>> hsapiens_dataset = mart["hsapiens_gene_ensembl"]
>>> scerevisiae_dataset = mart["scerevisiae_gene_ensembl"]

>>> hsapiens_df = hsapiens_dataset.query(attributes = ["ensembl_peptide_id", "peptide"])
>>> hsapiens_df
                       Peptide                             Protein stable ID
0       MAAAAGMLLLGLLQAGGSVLGQAMEKVTGGNLLSMLLIACAFTLSL...   ENSP00000003100
1       MAALLLGAVLLVAQPQLVPSRPAELGQQELLRKAGTLQDDVRDGVA...   ENSP00000002596
2       MTLLTFRDVAIEFSLEEWKCLDLAQQNLYRDVMLENYRNLFSVGLT...   ENSP00000005082
3       MLLGELGVFASYAFAPLSLIVPLSAVSVIASAIIGIIFIKEKWKPK...   ENSP00000003912
4       MTAELQQDDAAGAADGHGSSCQMLLNQLREITGIQDPSFLHEALKA...   ENSP00000003302
...                                                   ...               ...
120708  MRLDNMLLAEGVAGPEKGGGSAAAAAAAAASGGAGSDNSVEHSDYR...   ENSP00000514644
120709  MGTTASTAQQTVSAGTPFEGLQGSGTMDSRHSVSIHSFQSTSLHNS...   ENSP00000513343
120710  XTVLVHTREAATRNMEKIQVIKDFPWILADEQDVHMHDPRLIPLKT...   ENSP00000513219
120711  MRTEDLPKAVVFLEPQWYRVLEKDSVTLKCQGAYSPEDNSTQWFHN...   ENSP00000514360
120712  MADEKPSNGVLVHMVKLLIKTFLDGIFDDLMENNVLNTDEIHLIGK...   ENSP00000515267

[120713 rows x 2 columns]

>>> scerevisiae_df = scerevisiae_dataset.query(attributes = ["ensembl_peptide_id", "peptide"])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/tiltwolf/.local/lib/python3.10/site-packages/pybiomart/dataset.py", line 266, in query
    raise BiomartException(response.text)
pybiomart.base.BiomartException: Query ERROR: caught BioMart::Exception::Query: returning undef ... missing attributes for your exportable? 

Update: there appears to be an error on BioMart's end, because I get the same error if I try to query the peptide sequence through the BioMart website. Is it happening for others?