Issue with metaclonotypes

[jsh75]

When I run section 6 of the Meta-Clonotypes workflow on my own data, I get an error that says: "ValueError: '*' is not in list."

It occurs after running this: centers_df = bkgd_cntl_nn2( tr = tr, tr_background = tr_bkgd, weights = tr_bkgd.clone_df.weights, ctrl_bkgd = 10**-5, col = 'cdr3_b_aa', add_cols = ['v_b_gene', 'j_b_gene'], ncpus = 4, include_seq_info = True, thresholds = [x for x in range(0,50,2)], generate_regex = True, test_regex = True, forced_max_radius = 36)

Would this have something to do with my tr?