error handling in installs

app.py

@@ -8,8 +8,13 @@ import spaces
 
 # Download model weights (skips already-downloaded models automatically)
 # In total, ~6GB (3GB for RFD3, 3GB for RF3, <100MB for MPNN); may take a few minutes depending on your connection speed
-os.system("foundry install rfd3 ligandmpnn rf3")# installing model weights
 
+cmd =  "foundry install rfd3 ligandmpnn rf3"
+result = subprocess.run(cmd, shell=True, capture_output=True, text=True)
+if result.returncode == 0:
+    print("Models installed successfully.")
+else:   
+    print(f"Error installing models: {result.stderr}")
 
 #download_dir = "./models/"
 #if not os.path.exists(download_dir):