diff --git a/cvp_checks/tests/test_mtu.py b/cvp_checks/tests/test_mtu.py
index 735091f..940c145 100644
--- a/cvp_checks/tests/test_mtu.py
+++ b/cvp_checks/tests/test_mtu.py
@@ -62,5 +62,5 @@
             row.insert(0, interf)
             mtu_data.append(row)
     assert len(mtu_data) == 0, \
-        "Several problems found: {1}".format(
+        "Several problems found: {0}".format(
         json.dumps(mtu_data, indent=4))
diff --git a/cvp_checks/tests/test_packet_checker.py b/cvp_checks/tests/test_packet_checker.py
index 30ddb73..a583c24 100644
--- a/cvp_checks/tests/test_packet_checker.py
+++ b/cvp_checks/tests/test_packet_checker.py
@@ -38,7 +38,7 @@
             row.insert(0, deb)
             pkts_data.append(row)
     assert len(pkts_data) <= 1, \
-        "Several problems found: {1}".format(
+        "Several problems found: {0}".format(
         json.dumps(pkts_data, indent=4))
 
 
@@ -52,6 +52,7 @@
     output = local_salt_client.cmd("L@"+','.join(nodes_in_group), 'pip.freeze', expr_form='compound')
 
     nodes = []
+
     pkts_data = []
     my_set = set()
 
@@ -74,5 +75,5 @@
             row.insert(0, deb)
             pkts_data.append(row)
     assert len(pkts_data) <= 1, \
-        "Several problems found: {1}".format(
+        "Several problems found: {0}".format(
         json.dumps(pkts_data, indent=4))
diff --git a/cvp_checks/tests/test_repo_list.py b/cvp_checks/tests/test_repo_list.py
index 3e440a5..0e35f37 100644
--- a/cvp_checks/tests/test_repo_list.py
+++ b/cvp_checks/tests/test_repo_list.py
@@ -53,7 +53,7 @@
             rows.append("{}: No repo".format('pillars'))
             diff[repo] = rows
     assert fail_counter == 0, \
-        "Several problems found: {1}".format(
+        "Several problems found: {0}".format(
             json.dumps(diff, indent=4))
     if fail_counter == 0 and len(diff) > 0:
         print "\nWarning: nodes contain more repos than reclass"
diff --git a/cvp_checks/tests/test_services.py b/cvp_checks/tests/test_services.py
index 284956d..a623508 100644
--- a/cvp_checks/tests/test_services.py
+++ b/cvp_checks/tests/test_services.py
@@ -32,5 +32,5 @@
             row.insert(0, srv)
             pkts_data.append(row)
     assert len(pkts_data) <= 1, \
-        "Several problems found: {1}".format(
+        "Several problems found: {0}".format(
         json.dumps(pkts_data, indent=4))