Update app.py

app.py

@@ -184,11 +184,11 @@ with gr.Blocks() as build:
                 with gr.Row():
                     a_files=gr.File()
                     z_files=gr.File()
-        with gr.Tab("Source")
+        with gr.Tab("Source"):
             with gr.Row():
                 r_t=gr.Textbox(max_lines=100)
                 m_t=gr.Textbox(max_lines=100)
-        with gr.Tab("Dest")
+        with gr.Tab("Dest"):
             with gr.Row():
                 rd_t=gr.Textbox(max_lines=100)
                 md_t=gr.Textbox(max_lines=100)