added Some commets and new error massage, changed font color in label top of the Entry box becouse they cont visible in white color, i changed into black color.

Author: mr-d-luffy

youtubedownloader.py

@@ -1,6 +1,7 @@
-from tkinter import Button, Entry, Label, Tk, filedialog, messagebox
-from threading import Thread
-from pytube import YouTube
+# modules for Using of app
+from tkinter import Button, Entry, Label, Tk, filedialog, messagebox # Gui Modules 
+from threading import Thread # modules for multi threding 
+from pytube import YouTube # Module for Youtube service
 
 # this function for mulple code runes at a time 
 def threading():
@@ -22,7 +23,7 @@ def download():
         else:
             messagebox.showwarning("", "Download cancelled!")
     except Exception:
-        messagebox.showerror("Error", "An error occurred while downloading the video.")
+        messagebox.showerror("Error", "Some Thing Went Wrong!!!\nplease try again")
 
 
 # This code runes on only this file
@@ -44,13 +45,14 @@ def download():
     )
     introlable.place(x=35, y=20)
 
-    Label(root, text="Enter YouTube Link", font=("sans-serif", 16), bg="olivedrab1").place(
+    Label(root, text="Enter YouTube Link", font=("sans-serif", 16), bg="olivedrab1", fg='Black').place(
         x=40, y=150
     )
 
     url_box = Entry(root, font=("arial", 30), width=30)
     url_box.place(x=40, y=180)
 
+    # download button in UI
     btn = Button(root, text="DOWNLOAD", font=("sans-serif", 25), command=threading)
     btn.place(x=270, y=240)
     root.mainloop()