Update app.py

app.py

@@ -40,11 +40,10 @@ def run_capture(cmd):
     """Run a command and return stdout; raise RuntimeError with readable stderr on failure."""
     result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
     if result.returncode != 0:
-        stderr_text = result.stderr or ""
-        # Keep only tail to avoid massive logs
+        stderr_text = result.stderr or ""  # Keep only tail to avoid massive logs
         tail = stderr_text[-2000:]
-        raise RuntimeError("Command failed: " + " ".join(cmd) + "
-" + tail)
+        # KORRIGIERTE ZEILE:
+        raise RuntimeError("Command failed: " + " ".join(cmd) + " " + tail)
     return result.stdout