fix

cas9on.py

@@ -178,8 +178,15 @@ def create_genbank_features(data):
 
 
 def generate_genbank_file_from_df(df, gene_sequence, gene_symbol, output_path):
+    # Ensure gene_sequence is a string before creating Seq object
+    if not isinstance(gene_sequence, str):
+        gene_sequence = str(gene_sequence)
+
     features = create_genbank_features(df)
-    record = SeqRecord(Seq(gene_sequence), id=gene_symbol, name=gene_symbol,
+
+    # Now gene_sequence is guaranteed to be a string, suitable for Seq
+    seq_obj = Seq(gene_sequence)
+    record = SeqRecord(seq_obj, id=gene_symbol, name=gene_symbol,
                        description=f'CRISPR Cas9 predicted targets for {gene_symbol}', features=features)
     record.annotations["molecule_type"] = "DNA"
     SeqIO.write(record, output_path, "genbank")