Troubleshoot openLCA IPC

1. Confirm openLCA Desktop is running.
2. Confirm a database is open.
3. Start Tools → Developer Tools → IPC Server.
4. Make sure your Python code uses the same port shown in openLCA.
5. Check whether another application is already using that port.

The entity may not be in the active database, may use a different name, or your search term may be too specific. Try broader terms and inspect several matches.

• Check provider links.
• Check product-system construction.
• Check the reference amount.
• Check the impact method.
• Check that the database contains the expected characterization factors.

python --version
python -m pip show openlca-ipc

The current package declares Python 3.11 or newer. Use python -m pip when several Python installations are present so the installer and interpreter match.

Inspect the flow type first. Elementary flows do not use providers. For product/waste flows, list providers and verify that the active database actually contains an appropriate producing process.

Live calculation results must be disposed. Wrap extraction in try/finally so failures do not leave result objects open.

result = client.calculate.simple_calculation(system, method)
try:
    impacts = client.results.get_total_impacts(result)
finally:
    result.dispose()

• Inspect product-system size and process links.
• Check for unintended/circular model structure.
• Confirm the correct database/system is active.
• Do not repeatedly rerun the calculation when result inspection on the existing live result is sufficient.

• Minimal code sample.
• Full traceback.
• Python/openlca-ipc/olca-ipc/olca-schema versions.
• openLCA Desktop version.
• Whether a controlled database reproduces the problem.