diff --git a/src/build_reference_db.c b/src/build_reference_db.c
old mode 100755
new mode 100644
index e8ddcb9..9335d01
--- a/src/build_reference_db.c
+++ b/src/build_reference_db.c
@@ -226,7 +226,7 @@ int build_reference_db(const char* dms_name,
 		taxon1 = obi_taxo_get_taxon_with_taxid(tax, taxid1);
 		if (taxon1 == NULL)
 		{
-			obidebug(1, "\nError getting a taxon when building a reference database");
+			obidebug(1, "\nError getting a taxon with taxid %d when building a reference database", taxid1);
 			return -1;
 		}
 
@@ -236,7 +236,7 @@ int build_reference_db(const char* dms_name,
 		taxon2 = obi_taxo_get_taxon_with_taxid(tax, taxid2);
 		if (taxon2 == NULL)
 		{
-			obidebug(1, "\nError getting a taxon when building a reference database");
+			obidebug(1, "\nError getting a taxon with taxid %d when building a reference database", taxid2);
 			return -1;
 		}
 
@@ -248,6 +248,10 @@ int build_reference_db(const char* dms_name,
 			return -1;
 		}
 		taxid_lca = lca->taxid;
+		if (taxid_lca == 2558200)
+		{
+			fprintf(stderr, "\ntaxid1 %d, taxid2 %d\n", taxid1, taxid2);
+		}
 		if (obi_set_int_with_elt_idx_and_col_p_in_view(matrix_with_lca_view, matrix_lca_taxid_column, i, 0, taxid_lca) < 0)
 		{
 			obidebug(1, "\nError writing the last common ancestor of two taxa when building a reference database");
@@ -346,7 +350,7 @@ int build_reference_db(const char* dms_name,
 		lca = obi_taxo_get_taxon_with_taxid(tax, taxid_lca);
 		if (lca == NULL)
 		{
-			obidebug(1, "\nError getting a LCA from taxid when building a reference database");
+			obidebug(1, "\nError getting a LCA from taxid when building a reference database, taxid %d", taxid_lca);
 			return -1;
 		}
 		// Read alignment score