diff --git a/plugin/att/trace_view.py b/plugin/att/trace_view.py
index 1e9ae2cec1..8611d028e1 100755
--- a/plugin/att/trace_view.py
+++ b/plugin/att/trace_view.py
@@ -21,10 +21,11 @@ from http import HTTPStatus
 from io import BytesIO
 from drawing import Readable, GeneratePIC
 from copy import deepcopy
+from shutil import copy2
+from glob import glob
 
 JSON_GLOBAL_DICTIONARY = {}
 
-
 def get_ip():
     s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     s.settimeout(0)
@@ -259,11 +260,11 @@ def view_trace(
 
     os.makedirs(trace_instance_name + "_ui/", exist_ok=True)
     JSON_GLOBAL_DICTIONARY["live.json"] = Readable({"live": 0})
-    os.system(
-        "cp "
-        + os.path.join(os.path.abspath(os.path.dirname(__file__)), "ui")
-        + "/* " + trace_instance_name + "_ui/"
-    )
+
+    ui_dir_files = glob(os.path.join(os.path.abspath(os.path.dirname(__file__)), "ui")+"/*")
+    for f in ui_dir_files:
+        copy2(f, trace_instance_name + "_ui/")
+
     for k, v in JSON_GLOBAL_DICTIONARY.items():
         with open(os.path.join(trace_instance_name+"_ui", k), "w" if ".json" in k else "wb") as f:
             f.write(v.read())
diff --git a/plugin/att/ui/index.html b/plugin/att/ui/index.html
index 9f78232427..7a33992fbb 100644
--- a/plugin/att/ui/index.html
+++ b/plugin/att/ui/index.html
@@ -460,7 +460,7 @@
 					let L2FirstToken = {}
 					let L2InstTime = {}
 					insts.forEach((ins, i) => {
-						const line_num = ins[4]
+						const line_num = ins[4]-1
 						if (!(line_num in L2FirstToken)) {
 							L2FirstToken[line_num] = ins[0]
 						}